Electrical system problems
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Front turn signals not working 
Solved
Ford Mustang 2008 V6 Ford mustang coupe 146000 miles
Neither of the front turn signals are working. The clicking on the inside is normal, not the fast click you get when the bulb needs to be replaced. Both rear turn signals work fine. Is there a fuse somewhere for the front signals?
CommentNeed help Please !!!
Ford Mustang 2007 4.0 SOHC automatic 167895 miles
I have a 2007 mustang 4.0 with issues, i have tried everything i know i am at a loss at this point... PLEASE HELP.
Went to work and went to store before home and battery was dead had to be jumped, on the way home my gauges went haywire and car switched off and on while i was driving. It died on me just as i pulled in to yard. Checked fuses GOOD changed Battery GOOD.
Changed Alternator GOOD
Went to work next day it died on me on my way there. Jumped it off got it home now it wont crank at all. I have an odo dte fuel level error and odo fei dte error and check charging system. I bought this ca… Read complete
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13 reports
2008 Bullitt from United States 4 years ago
I was told to change the PCM doide fuse
Check all your ground wires, especially the one to the starter stud bolt.
Could be sjb inside fuse box, common problem fir these mustangs water/ moisture damage
1FSTSHELBY from United States a year ago
This seems like a bad ground or something in alt to battery wiring. Have seen this with a over charging issue after someone doing a big 3 wiring upgrade and didn't have it done correctly. When car over charges it will go nuts all lights go out while driving everything stops working electronically in car but car would stay running. I'd look at the wiring as starting point.
CommentCar will not start
Ford Mustang 2003 GT/4.6l 12576 miles
I was driving and all day and i cut vehicle off and when i went to start the vehicle it act like it was going to start it was like a quick vrrgh then went quiet my car is a stick manual transmission so i pop the clutch and the car started. So i figured it was the starter so i went out and purchased a new starter and put it on, and when i went to go start it same thing nothing and yes i put the starter on correctly. I check all fuses and there all good now i can't tell if relay is good or bad because the relay is all black. When I put the key in and turn the key all the lights on the dash come and everything but at that last turn i get nothing ,so I'm asking what could it be.
13 reports
Ignition switch,neutral safety switch on trans or easiest is to check all the grounds.
It is the clutch switch, when u push it in, does not fully put down the safety switch, I taped two pennies on the back of mine with black tape and it has never had that issue again
1FSTSHELBY from United States 3 years ago
Or you could reset the switch all the way back out and works perfectly again.
CommentThrottle response issue 2007 gt mustang Solved
Ford Mustang 2011 5.0 135000 miles
I swapped out 4/6 to a 5.4 motor it was running fine now there's suddenly no throttle response nothing works at all for the throttle when I turn the key on I checked all fuses checked all relays there's just nothing there everything has good power through it I just don't know what to do now I've worked on it for 3 weeks can't figure it out it did it once before but came out of it like 10 minutes later so I don't know can anybody help
4 replies
Best answer (according to natein701)
Anybody with any help for throttle isue just replaced tps maf n nothin still
I have had any problems with the throttle body. Also the pedal position sensor. Very popular problem.
Last post misprint. I meant i had many problems with the t/b & t/p sensor.
Thanks for reply i replaced all the sensors now twice and nothing changed it wont even start at all now i got fuel but it says data transfer somthing like that on dash now so im assuming its the tune i had done on it im having the guy come back and checking it out tomaro hopfully thats it but im not sure bout fed up with this project i learned allot from swapping the 4.6 to 5.4 it not that hard but few lil tricky things to get it in ther was fun when it ran not so much fun now that it not n just frustrated now
CommentBurn smell when I set the heater blower to #3, Solved
Ford Mustang 2006 mustang gt 117650 miles
Burn smell when blower is on #3. I already changed out the blower motor, resistor and pictail connector wire. I recently replaced the Relay mod for the blower motor but I have not evaluated the issue for improvement yet. Is there any other suggestions that I can consider before replacing the Resistor again? Please advise.
1 report
Best answer (according to Jacob)
I'm still 'not sure' if I fixed the issue yet, but so far I haven't detected any new burn smells when switched to 3. I think the Relay was the best fix of all, but no one even suggested that as the remedy. I spoke with many experts before acting on it and only spent $12. On the replacement and installed it myself. Shop charges of $150. Were avoided.
CommentProblem locating Horn Relay Solved
Ford Mustang 2013 Convertible/5.0/Auto/GT 97000 miles
The troubleshooter on this site and many others that I have viewed, all mention that the Horn Relay could be the problem when the horn fails to function. I can only identify a 20Amp fuse for the horn but NO relay. Am I missing something obvious?
6 reports
Best answer (according to FrustratedFordOwner)
FrustratedFordOwner from United States a year ago
Hello. I ended up scraping the plug connectors with a very small file as the metal pins were corroded. Been working fine ever since. Hope this helps!
CommentCooling Fan Relays Location? Solved
Ford Mustang 2003 2 Door Convertible/4.6L 150000 miles
I suspect that the cooling fan relay is faulty and is the cause of the fan not engaging at operating temp. I cannot find it, and no diagram shows it in the proper position. Can anyone tell me where I might find the elusive little culprit? Thank you.
2 reports
Best answer (according to Keester)
It was not in the Power Distribution Box under the hood, it was on top of the fan cowling, not identified as such.
Check the connector that goes into the fan. It's the pigtail on the car they burn out real easy
CommentCharging system Solved
Ford Mustang 2000 V6 3.8 210000 miles
Won't stay charged alternator, starter and battery all changed , many wires replaced
2 reports
Best answer (according to Made in fuxsake)
Commenttrying to find the fuse for the radio
Ford Mustang 2010 convertible top 154000 miles
can’t get the radio to come on or find the fuse. I don’t have the book for the Mustang.
10 reports
I don’t have a car booked for the Mustang can’t find the fuse for the radio
Same help it's my girlfriend car she had but kinda forgot about so I'm trying to fix it up for her
CommentWindshield wipers won't stay on fuses all good relays new but still na
Ford Mustang 2003 6.5 lilit 250000 miles
Fuses all good though I see no action for the wipers. And radio has no sound powers on but that's it.
18 reports
CommentRadio out, battery drain
Ford Mustang 2003 base, 3.8L, midnight blue pearlescent 142000 miles
Radio lost power, slow drain on battery over two weeks. Do not know location of passenger compartment fuse panel.
9 reports
Airbag light comes on but car won't start and key fob doesn't work. Intruder caught under hood. What'd he take or do?
I have a 2012 GT and I am currently having that problem. Initially I took it to my mechanic a year ago and he replaced the starter and the battery. Issue continued literally the next day. Battery dead. I had been jump starting it until another person that replaced my a/c compressor said it was my radio and that Shaker systems eventually cause problems. He took out the 20 radio fuse and I have had no problem starting it until I replaced the entire radio, amp and speakers last week. Now that the fuse is back in…. Battery dead and my air conditioner is blowing hot air! So replacing the radio wasn’t my solution either. There is a parasitic drain somewhere and having to get an electrical mechanic to look at it now. I’m frustrated and trending on broke at this point...
Bad6969Boy from United States 5 months ago
Let me know what you find out have an 05 doing the same thing thanks in advance
@Bad6969BoyI replaced the old radio with a new original stock Ford radio. The brand new apple car play did not work in that car. Then I replaced the battery and Alternator and it fixed the issue.
CommentFuse 47 always blows
Ford Mustang 2007 Base, 4.0l v6 118000 miles
Fuse leads to maf, evap, and 4 O2 sensors, sensors are good, wires are good, on initial key turn fuse 47 immediately blows, supposed to be a 15amp but blew a 30, stuck in limp mode because of it, traced problem to the fuse box itself, replaced it and fuse still imploded
4 reports
4.0LSilverStang from United States 2 years ago
I had this issue, Found out it was the fuse so i replaced it except mine worked for awhile it popped so i just bought alot of them cause i was too busy to deal with it and just kept replacing the fuses some would last longer then others sometimes even 3 to 4weeks, Eventually the problem went away, Still don't know what it was to this day. Car seemed to have fixed itself.
Honeybadger from United States a year ago
It's a short. Mine did the same thing periodically. One of the 02 upstream wires where barley touching the frame through a very small cut in the wire. When you throddle hard (various driving conditions) it would make a solid connection and blow the fuze shorting the 02 and maf connection putting the car in limp mode. Yours should be the same however the short could be in a different location. The only way to find the short is while it is in fact shorted. Aka one side will be negative the other side of the fuze positive. Following the wire under this condition you can cut it and check both ends Following the ground (that's not supposed to be ground) until you identify it's location. Likely start at the 02 sensor as that's where mine was.
Harvey jones from United States a year ago
@HoneybadgerHi I'm having a problem with a short disconnect the negative. Put a test light on the post to the cable it lights up not real bright and it keeps given a code bank 2 sensor 2 I have replaced the EGR it showed a code so now the map sensor is showing a code I'm trying to track it down with a wire tracker but not having any luck not to sure about the unit on the use of it any ideas would very much be appreciated thank you my name is Harvey jones
CommentWon’t start
Ford Mustang 2009 Ford mustang 45th anniversary edition 91000 miles
OK yesterday I started my car let it warm up and then when I was driving down the road it died. I had it towed to the shop and they checked everything and there are some pieces long. They fixed it in. My car was fine this morning I get my car to start it will start in both occasions the mileage on my car would not show up. They checked everything out yesterday and everything was perfectly fine. The motor that does everything was fine. It was just those fuses but now my car won’t start again please help.
3 reports
I still need help. My car won’t start everything will come in the dash except my mileage it just shows- - - - - - -
That07stang from United States 2 years ago
It may be a connection issue with the ECU. I had the same problem with my 07 only difference was my dash shows DTE Fuel Level Low. It wouldn’t start at all no matter what. I eventually found corrosion on SJB (Smart Junction Box) which caused some short circuits to do something to my ECU. This is just a start not saying it may solve it at all. It could be as simple as a fuel pump or as complex as an ECU or CANBUS system problem. I would search more about it.
Moonpie6988 from United States 2 years ago
I'm having the same problem except my dad going down the road and I was able to get neutral and start it but then it was idling and it died and now it won't start again
CommentAc compressor not engaging
Ford Mustang 2015 v6 108000 miles
Compressor not engaging , checked relays and fuses and the radiator fans are running time i crank car,
2 reports
Same issue I have I hope u got it fixed by now.
Bigswoll54 from United States 3 years ago
I don’t have this issue solved yet… I’m still looking for answers… Help
1FSTSHELBY from United States a year ago
Sounds like it's needs recharged if it drops below certain level the compromise kick on as to not damage the unit when running it out. I would start with getting recharge kit and properly draining the system of all it's air then recharge it as can tells you to do so. Once system is clear of air you can then replace it with your A/C freon until your level is back up in the safe green area. Once it does you see your compressor starting to kick back on and off make sure vehicle is running and A/C is on max when adding the freon
CommentCranks no start after changing radio,had to jump battery to crank.
Ford Mustang 2002 Coupe 125000 miles
I changed my radio to an aftermarket radio. Battery was dead before I changed it. Had to jump it off and now it cranks but doesn't start. Theft light is not blinking or staying on. Can't hear the fuel pump kick on.
7 reports
Have you tried to reset the fuel pump inertia switch
Also is your odometer working correctly or is there a bunch of dashes going across the mileage readout
CommentMy fuse box is under the steering wheel in cab
Ford Mustang 2001 Convertable 180000 miles
A fuse fell out and I'm wondering if that is to the fuel pump because cutting out and dieing was an issue but now it won't start at all. I can't find which fuse is fuel pump because you don't have the correct box on your diagram. Mine is under steering wheel not on passengers side
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2 reports
I would like a photo of my box with which fuse does what on the car.
CommentTurn the key and it won't turn over ( changed battery )
Ford Mustang 2006 4.0 186000 miles
I pulled the old battery off for about 5 day's. Replaced with a newer one, and my issue is it won't turn over ,When I turn the key on all the lights on dash is on including theft light I checked connections and tested relays and checked every fuse. Still won't crank. In leaning towards anti-theft or safety switch in the shifter. Any in put would be a great help. It's a 2006 v6 mustang.
5 reports
I have a 2014 3.7 v6
Same issue with 6000plus I changed starter relays and fuses. Associated. Im trying the diode to pump fuse needed to order one from ford parts counter. 4 bucks for the fuse if this dont work idk. It seems like this issue isnt easy or straight forward thing. Ford said it could be, 1. Pcm 2. Wiring 3. Bad battery 4. Starter relay 5. Blown fuses 6. Starter motor 7. Transmission 8. ABS module. That's a lot of could be problems. They were so excited when I asked the cost of all those items if they were to do them with labor its ridiculous. I spent money on issues they said and im already close to a grand.
Same issue with 6000plus I changed starter relays and fuses. Associated. Im trying the diode to pump fuse needed to order one from ford parts counter. 4 bucks for the fuse if this dont work idk. It seems like this issue isnt easy or straight forward thing. Ford said it could be, 1. Pcm 2. Wiring 3. Bad battery 4. Starter relay 5. Blown fuses 6. Starter motor 7. Transmission 8. ABS module. That's a lot of could be problems. They were so excited when I asked the cost of all those items if they were to do them with labor its ridiculous. I spent money on issues they said and im already close to a grand.
Commentcrank no start
Ford Mustang 2006 GT Premium 4.6L Manual Transmission 160000 miles
does anyone know how exactly the 1amp PCM fuse plays a part in the starting, I looked at the chilton repair manual here and there is no mention of it?
2 reports
The same issue here by Steve 4.6 2006 model the crank sounds like it wants to start but it won't have changed crankshaft sensor change camshaft sensors both of them check the fuel pump just working getting plenty of fuel to my fuel rails I'm running out of stuff to check I'm starting to wonder if it is in my Ecm and how do I find out or check it also having a problem with my scanner even linking up with my car
Comment1 reply
I can’t locate the relay for my headlights on 2016 ford mustang v6 convertible. Ford motor company told me to contact Ford dealership, they told me to contact Ford chatbot for $70.00 a question. $5.00 for a question, and $65.00 for membership. My manual doesn’t specify headlight relay location, or if it is grouped together with something else. Shops charge for diagnosing. Any help would be much appreciated.
CommentWill not crank
Ford Mustang 2010 Auto trans , 4.0 126000 miles
When I turn the ignition switch to crank, car loses all electrical power. Battery charge is good at 12.6 volts. New starter.
3 reports
Check the disable link to starter. Check your grounds.
Michael Pope from United States 7 months ago
I have the same problem is there a straight away answer
CommentNo crank no start
Ford Mustang 2007 Mustang 4.0 199256 miles
Have a new alternator and starter and battery in but it will not crank or turn over
1 report
Check your alternator wiring harness and wires mine did the same thing and that was the problem hope this helps
CommentWater leaking all over interior fuse box
Ford Mustang 2008 4.0 104000 miles
Wiring issues and and wrench symbol light appears on dash after water leaking on interior fuse box. There’s a new smell, possibly burnt electronics while driving and it idles slow and dies
1 reply
Kaptainkam from United States 6 months ago
Is it up near the firewall or all the way to the right in that channel between the frame and the plastic cover for the fuse box? I have a 2011 and found that the drain hole between the firewall and cabin filter was completely plugged with gunk that would force water to leak into the passenger foot area
CommentNeed the location of fuse for rear tail lights of my car
Ford Mustang 2005 V 6 82567 miles
Looking for location of the fuse for my rear lights
5 reports
CommentReverse polarity
Ford Mustang 2002 Gt 4.6 300000 miles
Made a mistake a hooked the battery terminals in reverse. Pretty sure I friend my alternator but now the car gets no power even with a fully charged battery. And I’m now getting a spark out of my ground side terminal when trying to jump start.
1 reply
I hope your issue got resolved, if not, check for a big fuse next to tge terminal, usually its of a high amperage (probably 80 amps). Afterwards, check on the fuse box in the engine bay, then in the cabin. Replace any blown fuses and your car will hopefully start
CommentFuses box location and fuse information
Ford Mustang 2000 3.8L V6 5 speed 240000 miles
Have a 2000 Ford mustang 3.8 L V6 5 speed. It has diagrams on here but not the right one that matches mine
1 report
Comment1 report
CommentCannot find power mirrors fuse
Ford Mustang 2012 Sedan, V6 43474 miles
Power side mirrors do not work, control know & wiring ok looking for fuse, not listed in diagram of my fuse box. Is this a line fuse
1 reply
CommentNot responding with fob
Ford Mustang 2016 90000 miles
My car’s fob is working i show to locksmith he told me it’s ok but my car not responding I checked fuse also it is working so please help me
1 reply
Try changing transponder, it's the wire that plugs in steering wheel,has a circle around key hole, it communicates to the injectors that it's the correct chipped key
CommentBlowen fuses
Ford Mustang 2002 v6 137656 miles
Need a diagram of fuse block just replaced rt rear cal and all brake pads
2 reports
Comment6 reports
Mine turn on blink once or twice and turn off
CommentProblems with a Mustang? Share them
Find what you needed?
Thank you!
Additionally, the issue could be caused by a problem with the turn signal switch, the wiring, or the bulbs themselves.