Will not start after swapping the wiring harness

Hi,

Hang in there. We'll get it figured out. I need more information. Are you referring to the original wiring harness that came with the truck or the one from the 1996? Also, I need to know the engine size.

Also, since the vehicle is a 1999, the wiring is going to be a good bit different. I'm not sure if you are able to connect the PCM and other important connectors.

What color are the wires in the cut harness? Could you take a few pics and upload them for me to see? Also, do you still have the original harness? If the engine is the same size, it should have been useable. You may have had to change a few sensors, but it should have worked. Let me also know if you are using the original PCM.

I will watch for your reply.

Take care,

Joe

5.7 vortex and i got a new PCM computer that was programed to the VIN number of the 96' truck! It's not telling truck to crank whenever I turn the key to crank it and I night have some of the connectors in the wrong place but it's getting fire to the started. I got sparks at the starter.

It's was giving me three codes po300, a po161 and a 1406 before.

Brad, is the 1406 a P-code (P1406)? Also, what do you mean by sparking to the starter? Is something shorting?

At the starter, there should be a heavy gauge wire from the battery, 12v at all times. The smaller wire is the trigger wire that should only get 12v with the key in the start position. Is that happening? Also, if you get sparks when you try starting it, are you certain everything is tight and not damaged?

I attached two different schematics below. The first two are for the 96 start circuit and the last two are for the 99. They are very similar. Take a look through them and let me know if that is how it's wired.

Joe

Got new PCM that was programed to the vin number of the 96 truck but it's all in the 98 truck and the starter is hot but when I turn the key it does nothing.

Brad,

I'm getting confused. Is it a 1998 or 1999? LOL Also, at the starter, there will be a smaller wire that is purple. It only should have power (12v) when the key is in the start position. Have a helper turn the key for you and check to see if that wire gets power. If it does and there is 12v to the starter from the battery (larger wire), the starter sounds bad.

Here is a link you may find helpful.

https://www.2carpros.com/articles/starter-not-working-repair

Let me know.

Joe