Underhood wiring color codes

[Heretic]

As you may or may not know I am in the process of converting a carb'd to an EFI setup. I need either a listing or some book scans of the underhood wiring. I am looking for neutral safety, AC, hot in run, hot in start ETC. I have a few mapped out here and there but I am trying to save some time. I know someone here has to have the electrical guide for an 85 popo car... hint hint

Thanks

[85crownHPP]

What type of wiring harness are you using? If its a 90-91 harness I can tell you exactly what you need to hook up... I did probably exactly what you are wiring when I did the CFI to SEFI conversion.

My 85 had two long wires on the driver fender by themselves that are the 'run' (red/green) and 'start' (red/blue) but Im assuming these were just for the EEC so you probably dont have them.
Yours should be in the wiring harness for your alternator/coil wiring, should be the same colors.
The 'start' wire going to the NSS is white/pink, and there's a grey connector with this wire and another red/blue (out from the NSS) by the tranny dipstick.
I would use the 85's A/C wiring, it should work fine. You'd have at least 4 wires to splice in to use the ECM harness integrated AC wiring, maybe more.
Once you splice in the NSS/start wires at the trans dipstick connector, you can use the integrated start wire at the solenoid too. Mine had high rpm startups until I did this.

[Heretic]

I got a custom harness from RJM. Gimme that info you have for a 90/91, should be relatively the same. My harness has power and ground [obviously], and the provisions for hot/start, hot/run, check engine, and AC relay. Otherwise, it is a standalone harness. I need the NSS info to make sure it starts, and has reverse lights when appropriate... Although that's actually running through the Baumannator harness and not the RJM harness.

[1987cp]

My 85 had two long wires on the driver fender by themselves that are the 'run' (red/green) and 'start' (red/blue) but Im assuming these were just for the EEC so you probably dont have them.

Negative, '87 carbruleted cars for sure had equivalent provisions. For an aftermarket ignition they can just be wired together and run to the small red wire on the Hi-6 box or whatever so it's powered both in Start and Run. I don't remember for sure what color the wires are in the '81, but I haven't had a battery or a lock cylinder in that car for some time, so it's been a little troublesome to test it.

I know the reason for the two different wires was originally to operate the start-retard function of the old DSII systems. What start-retard provisions, if any, does the EEC/TFI system have?

[Heretic]

Negative, '87 carbruleted cars for sure had equivalent provisions. For an aftermarket ignition they can just be wired together and run to the small red wire on the Hi-6 box or whatever so it's powered both in Start and Run. I don't remember for sure what color the wires are in the '81, but I haven't had a battery or a lock cylinder in that car for some time, so it's been a little troublesome to test it.

I know the reason for the two different wires was originally to operate the start-retard function of the old DSII systems. What start-retard provisions, if any, does the EEC/TFI system have?

Not 100% sure. I know the TFI module needs the hot in start wire, so it probably has a similar function built in. I have the red/green wire tracked already and what I believe to be the check engine light. Trying to integrate this EEC-IV as close to the stock vehicle as possible. I want all the existing functionality without hacking up the wiring too badly...

[gadget73]

85 wouldn't have had a check engine light. The red "engine" light is for overheating and no oil pressure. You can have computer faults out the ying-yang and nothing comes on. Honestly, I'd soone re-wire that red light so it worked as a check engine light and install real guages than leave it as original. A CEL and guages are more useful than the red "replace engine" lamp.

[Heretic]

I am re-using the CEL tied into the A9P for a regular check engine light. I also want the amp light working with the new alternator as well. Trying to get everything integrated as well as possible. I already have the police package gauges under the ashtray for water, oil and volts. I am moving those to the top space in my Jotto Desk and possibly adding a pillar with more.

Pete do you know the color code of the AMP light wire from under the hood?

[gadget73]

It would be the wire going to the I terminal on the regulator, should be light green/red

[Heretic]

Sweet, thanks. I will br doing more wiring tomorrow.

[packman]

My Service Manual from Helm Publishing has wiring diagrams in the back. I think they have one for the P72. Unfortunately I don't have a scanner. Is there any other way of getting this info on here? Also, aside from a scanner, what else do I need to scan pics (software?)?

BTW Heretic, definitely can't wait to see pics of this beast.



Packman

[87gtVIC]

Take a picture.