Hi! I have a problem whit my Silverado i don’t have e u communication and half of the gauge don’t work

I have a 2003 Chevy Silverado 1500 4.3 L I changed the engine control module and it started and installed and it won't start any suggestions I've changed spark plugs spark plug wires distributor distributor cap and the coil also

Service engine came on. Then instrument panel displays power lose. I replaced all of the sensors on my engine. Replaced ecu, throttle body control module and the connector, fuel injector all 8 , 8 spark plugs, and plug wires, fixed electrical short in the wires2 inches from BCM. It turn over but does not start. Im going to replace the fuel pump next. Any ideas I had the ecu programmed by a dealership. Cost 150 dollars. Crank no start. Dealership said replaced the Bcm. I did also reset the bcm to my truck. Security light went off also.

Help no crank no start 2010 4.3 LS to a 2009 5.3 lt swap why no crank no start with programmed key and all boxes pcm bcm circut breaker and underhood junction box from 5.3 and engine harness. The body harness is still 4.3. No power locks no power windows. Throwing codes for crankshaft variation no learned and feul circuit. Do I need to reprogram bcm as well as pcm? or pinout the body harness at the juntion underhood to match 5.3?

I obtained a 2006 Chevrolet Silverado 1500 but the pcm got stolen so I put in another one from a chvy van with the same engine, although the engine starts, the fans dont turn on because the van had only one fan and the truck has two small fans. We tried to program the PCM but they told us it wouldnt go through. Could there be another reason as to why the fans dont turn on?

Starter solenoid clicks but will not pull starter in. Have changed starter, no help. Noticed 30 amp Stud 2 fuse blown. Accessories, trailer lights. Does that have anything at all to do with the start system. Also thinking it could have a problem with grounding. Can't read a ground on the black and yellow PCM ground wire. Any suggestions?