Duts87ss

iTrader: (10)

I've got a harness that came out of a '86 IROC to do a TPI swap into my Monte. I've found a few connector that I'm a little confused about.

The first pic shows a black wire with single terminal; it splits into two wires that are cut. Any ideas?

The second pic is of a two wire terminal (green and tan or white wire). The green wire goes to terminal B8 (AC Signal). the white wire comes off the first terminal and ends in a spade connector (third pic). Is the two prong connector supposed to go to the compressor? The Monte AC isnt integrated into the ECM that I know of. Where would the single spade connector go?

Duts87ss

iTrader: (10)

The first pic here is a green wire that my information says is the EGR Diagnostic Switch connector. What would this plug into? The only emissions eqipment I'm keeping is the EGR valve and canister purge; so, if I dont need this just let me know.

The second pic is a two wire connector. I didnt trace this one but am guessing its the oil pressure switch connector. Would this make this harness a '87-'88 harness?

Thanks for any help guys. I'll post more as I find more information on the cut wires I have.

Duts87ss

iTrader: (10)

Come on guys, over thirty views and no one has any ideas on these connectors?

Shagwell

get all the pin lay outs for the plugs. - the a/c isn't integrated into the TPI ecu, it just needs to know when the a/c is on to adjust accordingly.
- I'll check on it when I get home.

firebirdjosh

iTrader: (1)

Just follow everything on a wiring diagram.

ResurrectingZ

You're right about the oil pressure switch, it would be out of an 87+ wiring harness. I have my 88 wiring harness laying on the dining room floor, when I get home I will try to help identify the others. The single black connector I have seen somewhere before, the third pic from the first post looks like a melted knock sensor plug, I will let you know more when I look at mine.

Duts87ss

iTrader: (10)

It's not the knock sensor wire; it's at the end of the white wire that's part of the connector in the second pic. It's also a spade connector inside a rubber boot (not the same as a knock sensor connector [which is plastic, I believe]). I've already located the knock sensor wire elsewhere in the harness (with it's terminal clipped off, but I've got a spare).

Thanks for the help guys, I really appreciate it.

Duts87ss

iTrader: (10)

Were either of you guys able to check on the connectors last night?

Thanks

8Mike9

On my '89, there are two connectors on the AC compressor, a two-pin up front, and a single spade at the rear of the compressor.

Duts87ss

iTrader: (10)

Mike that's good info; I've also got a serpentine setup to install as well. In the first post, the second pic is a two pin terminal. The green wire comes from the ECM and the white wire terminates at the connector in the third pic.

On the serpentine compressor, I'm assuming my factory two-pin harness will connect to the front pins you mention, not sure about the rear pin.

Keep the info coming guys.

Thanks

Duts87ss

iTrader: (10)

Update: I found out the EGR diagnostic switch (first pic, second post) is the same as the EGR temp switch.

I just looked at another ECM pin diagram and it shows B8 going the A/C high pressure switch. That still doesnt explain what the white wire is for, though.

Duts87ss

iTrader: (10)

Could the black wire in the first pic of the first post be for the temp sensor in the pass head for the fans? If so, I can just remove this as I'm using a Mark VIII fan with a DC Control unit.

toddztoyz

Hey Dustin! Looks like I am not the only one checking out the f-body sites! You are asking the same questions that I am trying to figure out too! I hope your swap works out, mine is going good, but it is a slow process. I am using the painless wiring harness that has everything labeled. If you can tell me the connector style, how many wires are in it and there colors, I can try to tell you what they are and where they go as best as I can.

Todd

Duts87ss

iTrader: (10)

The connectors I'm still having trouble with are the last two pics in the first post.

8Mike9

The last one resembles the connecter that plugs into the rear of my ac compressor, the first one looks like the one that plugs in the front of the connector...but yours "looks" a little fatter. Pretty sure the wiring colors are the same. Have to take another look today.

If I can get my digital camera back today, I'll take some pics off my '89 for you.

Duts87ss

iTrader: (10)

Mike, if you could get pictures, that would be awesome.

My1986IROC-Z

I just recently did a carb to TPI swap with an 86 harness and TPI set-up. What are you still needing to know?
Tony

Duts87ss

iTrader: (10)

The last two pictures in the first post show the connectors I'm confused about.

irocjohnny

The 3rd picture looks like it could possibly be for the oil pressure switch. Is it rubber with female connector in it?

Duts87ss

iTrader: (10)

It's rubber with a male connector. Just for clarification, the white wire in the third picture is the same as the white wire in the second picture with the two-pin connector.

8Mike9

I'm having serious digital camera issues...my kid won't bring it back home

If she drops it by tomorrow, I'll get the pics for you.

Duts87ss

iTrader: (10)

No problem, whenever you can get them is fine.

Thanks

Duts87ss

iTrader: (10)

Thought I'd bump this thread again. I'm still unsure of where the last two connectors in the first post go. I'd really like to get started on this swap.

ResurrectingZ

I will look tonight at my old 86 wiring harness tonight if I can get a chance. Better to see it in person.

CreepingDeath94

iTrader: (4)

That last one has the same connector as a knock sensor, but hooks to like a water temp sensor or something right below the exhaust manifold...at least on my motor. Thats why its usually all melted like that. Hope that helps a little anyway.

Duts87ss

iTrader: (10)

Creeping, the last connector isn't the same as a knock sensor connector. It's actually a male spade connector with a rubber boot around it.

8Mike9

Let's see if these pics will work.

Duts87ss

iTrader: (10)

Mike, your first pic is of the same connector that is in my Monte's underhood harness for the AC compressor. The second picture doesnt look like anything I've got.

Thanks for the getting the pictures.

3rdgenZ

iTrader: (1)

it could be your temp sensor to the driver side head. the second looks like a pug that goes into your compressor.

80Sierra

The brown one strikes me as being for an oil pressure gauge / idiot light sending unit. Looks similar to the connector used on my truck's oil pressure sending unit.

I think the first one may be for an emission's solenoid, possibly the Canister Purge solenoid? It has a brown wire and green wire according to one of the diagrams from chevythunder.com

Other than that, I haven't the foggiest what they may be used for on a third gen. If you are just swapping the tuned port in, and all your gauges etc are working, and you do not have any emissions hooked up, I'd personally simply eliminate them, but hang onto the wiring incase you run into what it is used for in the future.

sicc87

the very very first pic up on the first post.. that looks a lot like the connector for the light on the hood.. the pic to the far left of the first 3 you posted..

mnorton

The third photo single white wire looks like the one that goes to the oil pressure sending unit back by the dizzy.

Duts87ss

iTrader: (10)

This is what everyone keeps saying, but why would it be connected to the two-pin connector in the first post (the one for A/C signal)?