04 5.3 in a 72 Chevy truck wiring help???
11-06-2007, 03:25 PM
#1
04 5.3 in a 72 Chevy truck wiring help??? I have a 5.3 that I'm turboing and putting into a 72 Chevy pickup http://www.performancetrucks.net/for...d.php?t=381116 and I need a little help with the wiring. I have the pin out diagram for the PCM (it is a out of a 04 Tahoe with FF) but I need to know what other wires I need to make it run. I have already removed all the wires for the sensors I didn't need in the harness. I think I need some more of the wiring diagrams so I know what wires I need to run for the data port and the fuel relay and all that external stuff and to power the PCM and stuff. Can anyone help me in wiring this up? This is he last thing I need to get this project running. My email is kybrown@gmail.com it you can send me the rest of the wiring diagrams I need thanks!
Last edited by kbracing96; 11-10-2007 at 11:57 AM.
11-10-2007, 11:56 AM
#3
Well, wiring is pretty much done, but I have a question. There are 2 wires coming out of the PCM that my diagrams says are for UART Serial Data but they are different colors then the diagram says. One is yellow and comes out of blue 14 and the other is green and comes out of blue 15. The standalone flashing harness diagrams I have come across say to use pin 15 for the data connection so that what i wired to the OBDII port. Is that correct? What is the other (yellow) wire for??
11-11-2007, 05:54 PM
#5
Ok, got her running 
but am having a problem with the fuel pump relay. Only way it will run is if I manually ground the relay. I rechecked my wiring and it tells me that that pin 9 (grn w/white strip) on the green C2 connector is the primary fuel pump relay control. I have this wire connected to the ground on my relay, but it doesn't do anything. The PCM is throwing a fuel pump relay control code. Any Ideas here???
but am having a problem with the fuel pump relay. Only way it will run is if I manually ground the relay. I rechecked my wiring and it tells me that that pin 9 (grn w/white strip) on the green C2 connector is the primary fuel pump relay control. I have this wire connected to the ground on my relay, but it doesn't do anything. The PCM is throwing a fuel pump relay control code. Any Ideas here???
11-11-2007, 08:46 PM
#7
At least I didn't fry anything, I just assumed it was like most everything else on these motors, where the PCM provided the ground to turn it on.
THANKS A TON 68shortstep!!
But heres a few teasers for the guys would didn't click the link in the first post! 
