Wiring problems
Top problems
Stereo Wiring
Ford F-150 2001 XL Sport/4.2/5 speed 19782 miles
Need identification of wire colors for install of aftermarket stereo. [Dual] Blue Tooth rec.
CommentTransmission or wiring problem ???
Ford F-150 2005 Pick UP 154000 miles
Drive Vehicle will shift from 1st to second and to 3rd then 4th but will donshift to 3rd and over drive light blinks and engine goes into failsafe mode and showes Transmission Malfunction yet transmission has been rebuilt ???
8 reports
I am having the same issue with mine. At first it started kicking out of over drive when would let iff the gas, and the o/d light would blink. Now it is saying transmission malfunction.
I have an F150 2008 R-D Swapped Transmissions from a 04 hooked up wiring added fluid and added a new input shaft sensor took it for a run trans faulty light and O/D came on How is that different transmissions
My 03 started shifting out of overdrive into third when I would let out of the fuel and it wound up being the broken center support
My 2005 Ford f150 fx4 only goes reverse and maybe like 3 mph forward
Lukeduke22 from United States a year ago
I have a 2008 f150. Won’t shift out of 2nd. I don’t have an rpm gauge but I can hear the rpm’s redlining at 30mph. When I turn override on I can get up to 45 but it doesn’t like it. I’m thinking it’s a shift solenoid but I’m not sure. Anyone else have this issue? Also tranny is 4R70w
Comment3 reports
Hi Cobb, maybe this diagram helps? http://goo.gl/l6XBtU You have a 1986 F-150, right? Let me know if it helped or if you were looking for other type of diagram.
Hey do you by any chance have the wireing digram for a 1991 ford f150 5.0 motor from the fuel pump to the switch inside the cab
I have a 2005 f150 and I damn near changed everything from the starter the flywheel alternator timing belt cover truck is not cooking over it dies within 5 seconds I don't know what else left if your injectors I think it clogged and not letting gas through because it wants to start but it don't it's not getting enough gas could that be my issue for anyone out there who may know please help me out it's been already almost 2 months since my truck has been parked
CommentNeed help with amp remote wire
Ford F-150 2019 145000 miles
Using a fuse circuit adapter, what fuse should I tap into for a remote wire on a 1200w amp to power subwoofers? 2019 f150 xlt
1 report
Your audio head unit should have a blue wire to connect to, if not you can splice into the red wire going to the head unit, or fuse 8 is for the head unit.
CommentBattery drain from bcm wiring/ harnesses
Ford F-150 2010 5.4L v8 crewcab 100000 miles
Need bcm connector diagram for 2010 f150 5.4 L shorted wiring in harness
1 reply
lawrence101 from Canada 3 months ago
BCM draining battery overnite need wiring diagram for harnesses
Comment2 reports
This could be a few things. Check bcm lower passenger kick panel. Lower black plug with grey lock should be up top dead center to be locked. Most jump in and out. Also tsb out for fuel pump relay that burns up. Make sure you look into this and relocate the fuse... hope this helps
CommentWireingdigram
Ford F-150 2018 F 150 1790052 miles
Burned body control fuse n starter relay fuse need a color diagram of wire harness going to fuse box
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1 report
Need wiring for 1991 ford f 150 to fuel pump
CommentWires going to solonoid
Ford F-150 1997 F150 5.4 liter 2 wd 324685 miles
My brother owns this truck but I'm trying to help him fix it.He removed the startor due to it wouldn't start click or anything.He had battery tested and it's good 650 cold cranking amps.He removes the old startor and didn't pay attention to where the wires was connected to the solenoids so when he put on new startor not sure which wires go where.FYI to remove and reinstall a startor on this truck is a pain even with front Tire off and inner fender well removed.Any idea which wire goes where on solonoid?
3 reports
Hi! I found this diagram, let me know if it is what you were looking for: http://ww2.justanswer.com/uploads/kenn… good luck!
CommentThe knock sensor wiring is not complete
Ford F-150 2016 Hatchback 108885 miles
I did not see the knock sensor wiring
Wiring problems
Ford F-150 2005 King ranch 5.4 205000 miles
I am in need of a wiring diagram for the PCM, I have a external plug in the the wiring harness that someone has put a different plug on and the pickup is in limp mode, I need to check the wiring to the 2 plugs and make sure it was wired right
Wiring diagrams for 2007 f150 4.6 liter engine
Ford F-150 2007 4.6 1260000 miles
Need diagram from ignition switch to pcm and engine ignition and fuel system
ABS wiring connection
Ford F-150 1998 4.6 365000 miles
Where is the wiring connection under the hood for ABS
Engine compartment wiring
Ford F-150 2003 Wiring 170000 miles
Just did it engine swap you need to find a plug by the firewall
1
Took out cup holders and wire ripped out.
Ford F-150 2002 3.4 triton 200000 miles
Ripped out the cup holder the wire came off. Now my blinkers dash lights for speedo and radio number lights don't work
Fuses or wires
Ford F-150 2004 100000 miles
Won't go in gear when headlights are on and turn sigsignals don't work
2 reports
No power to remote or ignition wire to radio. All screen a Without B/O
Ford F-150 2021 F150 srx supercrew 64999 miles
No power coming from 12v or remote wires from radio. Screen seems to have all functionality but no sound or signal coming from radio
Transmisson or wiring problem
Ford F-150 2005 4 door king ranch 175000 miles
Drive Vehicle will shift from 1st to second and to 3rd then 4th but will donshift to 3rd and over drive light blinks and engine goes into failsafe mode and showes Transmission Malfunction yet transmission has been rebuilt
1 report
The wire loom at the back firewall going up onto the hood, and then to
Ford F-150 2011 6.2 Raptor SVT 178000 miles
The lights in the grill and the two small marker lights are not coming on
Wiring or fuses/relay
Ford F-150 2001 4d/4wd/5.4triton 300000 miles
The windows and radio stopped working and when I put a fuse in, it instantly blows the fuse and you can see it spark. I need help 😩
4 reports
Wiring or fuses
Ford F-150 2001 4d/4wd/5.4triton 300000 miles
My windows and radio have stopped working and when I put a fuse in, it instantly blows it and you can even see the fuse spark
4 reports
Need to wire the module to see which wire goes to the fuel pump
Ford F-150 2014 5.0L F150 248350 miles
I need a wire diagram for the fuel module that is located in the chassis by the spare tire
8 reports
Wiper wiring or switch?
Ford F-150 1998 Ford F150xl 2500000 miles
Wiper moter went out, got new motor installed it burned out right away, checked wiring and found that with key off on on I had power of 5.38 to white wire and 5.38 to greenish wire. Black + White wire has 12v when key is on and ground is working ok along with park wire. Now this isn't right, you should only be gettin power to high speed wire or low speed wire when wiper switch is engaged so is it a wiring issue or has the switch gone bad?????
3 reports
Cant seem to get wires right to anti theft emmo system
Ford F-150 2000 Ford 66000 miles
Need to re wore transceiver
2 reports
No power to trucks premium packar wiring harness
Ford F-150 2003 4.6 L xlt super crew 103000 miles
Multimedia player wont power on
1 report
Wiring problem
Ford F-150 1978 351 58000 miles
Truck starts when it's cold when it warms up it won't fire unless I hit key switch with something. Replaced key switch same thing
1 report
3 reports
Truck will not start 
Solved
Ford F-150 1991 4x4 5.0 187000 miles
I was driving down the road and the truck started hesitating and running rough I tryed giving it more gas and it just kept falling on its face I barely made it back to my house only going like 7 miles an hour and I can try to start it now but have to hold the gas to the floor and it will barely idle or stay running very rough I have check fuel pressure I have checked my timing I am getting good spark on all my wires I'm lost on what els it could be I have replaced plugs fuel filter plz help
41 reports
netdrummer from United States 4 years ago
Sounds like maybe fuel pump. Pump and strainer are in the gas tank. They are a ceiled unit. Would recommend replacing if you are having trouble. Check for a service hole before removing the entire tank first. Can save a lot of time.
Vettesteve from United States 2 months ago
@netdrummerI thought fuel pump first thing but I had three that went bad on me over life and the all gave me time before they just died ,just want to test a few things before I pull the tank ,I was thinking someone put stuff in the gas. Idk.
Possible fuel pump or dirty/clogging fuel filters
Best answer (according to Cmowers22)
I done checked all of that my problem ended up being a completely clogged catalytic converter
What did u do? I just bought one today test drive went fine I had a 2 hr ride home she fell on her face and died! I let her sit for a few when I started her back up full revs so I dumped and let her roar need less to say back on her face in 20 minutes and less time in-between attempts she made it home tho
Mine is doing the same thing. Had the fuel pump and filter replaced as well as the catalytic converters
Could the manifold gasket be the problem? Any help.
Could the manifold gasket be the problem? Any help.
netdrummer from United States 4 years ago
If there is a fuel filter on the chassis, check and replace that first.
David Perazza from United States 5 years ago
I have a 2005 f150 5.4 3v...Accelerates and goes through the gear just fine as long as you don't press the accerator all the way down. It seems the as long as you keep the pedal about one inch from the floor board its normal but once you pass that inch, it will bog down at any rpm...Any ideas...Already changed the mass air throttle, fuel pump, injectors, fuel filter, Oxigen sensors...Thanks for any input...there is no codes.
Check tps. Also will prevent starting if completely bad
Jasper Gamble from United States 5 years ago
Mine was a easy fix. Replaced IAC ran good then started doing same thing next day. Thinking fuel pump pump relay filters vacume leaks air filters? After thinking the worst realized my battery cables weren't even tight. That's all it was.
AngelGagne from United States 5 years ago
On my 2006 Lariat I’m the only owner. At 103,000 miles she wouldn’t want to move, had zero power and made a clicking from engine when I tried to hover her gas…. I replaced all spark plugs and wires, & the Catalytic converters were completely shot, so I replaced both and the mass air flow sensor we replaced but it ran crappy with new one so we put old sensor back in and she runs like brand new!!!
Same issue checked fuses and relays still nothing
F150 never starts. Incompetent engine and horrible fuel system.
Truck won't start won't roll over no power to windows, door locks, radio won't come on no light to radio or a/c control panel changed ignition solenoid still no crank
Elizabeth Patterson from United States 6 months ago
Catalytic converters were completely shot, so I replaced both and the mass air flow sensor we replaced but it ran crappy with new one so we put old sensor back in and she runs like brand new!!!
CommentBattery drain Solved
Ford F-150 2011 Super Crew/5.0L Flex V8 191720 miles
Battery drain, I can put in a new fully charged battery in use the truck for a couple of days as normal. Normal driving distance is less than 60 miles to and from my work site and to a few other places through out the day. By 3rd morning I have to use a jump starter to start the truck. The truck starts fine through out the day. The next morning I have to use jump starter again. I've checked relays, replaced some old cracked fuses in the engine fuse box, disconnected a reese tow unit that I don't use anyways. Found a faulty wiring harness in the left rear driver door, replaced that also. I've not had time with work, and the horrible weather to do much on checking all of the fuses.
2 reports
Update, worked on blower speed problem. Pulled and tested blower motor and speed selector resistor controller. Controller is defective. Been testing all afternoon, the truck starts, on a very weak battery, sometimes it takes a few tries and a couple minutes of waiting and it starts.
Put a new controller on, however, it was not new. Got some bad controller that someone returned as good. The store clerks didn't check the return. However, they did swap with me. Got a good controller but have a truck that doesn't start. Waiting for warm days. The drain isn't my blower or temp controller. I think it is the starter or starter ground.
Johnnybjohnny from United States 2 years ago
Similar problem. Everything off yet the blower motor still works without keys and dash gauges move up and down as well as the odometer comes on and off. It like there are current spikes happening. Drains battery within about 3 hours have to jump start it.
That sounds like a relay locked on for the blower. The rest sounds like loose or bad grounds. Check all ground points you can see, and rust, or corrosion wires clean off. With these new trucks could be anything. I saw one ford with a drain that was bad. The exterior lights, and headlights would come on by themselves intermittently and it was corrosion on two pins in a wire harness not being used inside the dash.
Johnnybjohnny from United States 2 years ago
@HenryThank you for the reply. I’ll see what I can do.
@JohnnybjohnnyIf you haven't done so, you can check on this site for diagrams of fuse and relay boxes for your ford. Best of luck on fixing your problem.
New Problem - no start, battery good. Truck will start if leave key in ignition for a minute or two and then it cranks. Replaced starter, original starter, badly rusted. Starter had 192K on it. This has the no start issue. Going to swap around relays for starter, and planning on replacing FPDM in rear. Starter was not easy to replace.
Best answer (according to Henry)
Issue with Battery Drain, and fail to crank until after a few minutes with key in ignition. Battery Drain was two items - Rusted Starter - Replaced.
Fail to Crank - was Transmissions Shifter Position Sensor. The shifter sensor on the 5.0 V8 Flex is in the transmission. The sensor was failing, and telling the computer that the truck was already in gear. Cars in gear will not start. Cars in Park or Neutral will start. I was told there was something known about this in Ford Tech bulletin or service manual. It would be simple for them to print it in the owners manual.
Fail to Crank - was Transmissions Shifter Position Sensor. The shifter sensor on the 5.0 V8 Flex is in the transmission. The sensor was failing, and telling the computer that the truck was already in gear. Cars in gear will not start. Cars in Park or Neutral will start. I was told there was something known about this in Ford Tech bulletin or service manual. It would be simple for them to print it in the owners manual.
Same issue, but I dont get three days, usually overnight. I did notice that when in Park the P is not orange like all other gears. I was told PCM board, faulty transmission cable either at the top of transmission or in the steering column.
CommentNo turn or brake lights in the back
Ford F-150 2012 5.0l 4x4 170448 miles
I lost brake and turn signal lights in the back. I have running lights and the brake light on the back of the cab works. Fuses good. Can’t find any apparent breaks or rubs in the wiring. I’m stumped...
9 reports
Do you know what the problem is or was my truck is doing the same crap.
Anyone find anything on thus? Mine has done it now and I'm stumped
My truck has done the same thing anyone know how to fix the problem
AK47 MarkM from United States 4 years ago
Same issue i have on 98 f150 4.6 2wd you figure this problem is common and ford should rewire this and make it right for the owners the customer is always right and i know that there is a major issue with electrical shorts in the factory harnesses.
Has anyone figured this out already imbstuck
DavyBoySmith from United States 2 years ago
replaced BCM Body Control Module in my friends and had the dealer flash a junkyard unit.
$160 for BCM
$300 for dealer to flash the module as it holds the key codes for the anti theft system.
if you want to know exactly what component failed: it is a "Quad High Side Switch" NXP Part number 10XS3435D.
if you know somebody skilled enough to:
1. Open the BCM
2. desolder the 4 connectors holding the BCM boardstack together.
3. Replace the defective IC (REFDES U20 for right rear blinker/brake light problem or U11 for left rear blinker/brake light problem) with an SMD rework station you can save the $300 Dealer labor for flashing the module.
I am currently repairing the original, I will post my work if successful.
$160 for BCM
$300 for dealer to flash the module as it holds the key codes for the anti theft system.
if you want to know exactly what component failed: it is a "Quad High Side Switch" NXP Part number 10XS3435D.
if you know somebody skilled enough to:
1. Open the BCM
2. desolder the 4 connectors holding the BCM boardstack together.
3. Replace the defective IC (REFDES U20 for right rear blinker/brake light problem or U11 for left rear blinker/brake light problem) with an SMD rework station you can save the $300 Dealer labor for flashing the module.
I am currently repairing the original, I will post my work if successful.
CommentTrailer running lights
Ford F-150 2022 2003 miles
Turn signals and brake lights work but running lightts do not...
Can I find a blown fuse for the problem nor a proper wiring diagram and map of the fuse box
Can I find a blown fuse for the problem nor a proper wiring diagram and map of the fuse box
19 reports
Check wiring harness connector up next to spare tire. I had same issue and that's where problem was. It's easier to fix if you remove spare tire. Use 12V test light to find wire. Good Luck
Having the same problem. No running lights or back up lights. Fuses are good. Strangely I'm only getting like .5 volts on the lights that do work. Not sure if tester is faulty, or what.
CommentProblems with a F-150? Share them
270000 miles