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The "What is this and where does it go?" thread...
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue May 13, 2014 8:12 pm    Post subject: Reply with quote

Coil wire would be pink, not red.

Burned connector could possibly be AC relay. '89 should have used a round relay though. Odd.

Vacuum can is down in one of the fenderwells. It will be under the battery tray or under the EVAP canister.

Cam shouldn't affect the HVAC. Hook the vacuum can up correctly with a check valve and it will be fine.
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue May 13, 2014 8:17 pm    Post subject: Reply with quote

I'll be darned, I found the vacuum ball. It is mounted to the underside of the battery tray where no eyes can find it. It has one hose going to it and I had a piece of tape on it labeled, "Manifold Vacuum".

Now what good can that little dinky vacuum ball do on a 7.0L engine with a 4" throttle body? Shouldn't there be a check valve somewhere so that the HVAC controls can feed off the vacuum ball when the manifold is not pulling vacuum?
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue May 13, 2014 8:20 pm    Post subject: Reply with quote

Laughing You're getting so good that you answer questions before you see them. I was writing my post while you wrote yours.
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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Tue May 13, 2014 8:22 pm    Post subject: Reply with quote

Amazing what a guy with a working memory can do.

I have to figure out everything over and over again myself. On the plus side everythings always new. Laughing
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aaron_sK
Member


Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue May 13, 2014 8:26 pm    Post subject: Reply with quote

chevymad wrote:
Amazing what a guy with a working memory can do.


That's okay, I'm losing it fast enough as it is, Laughing

The check valve is Dorman #47150. Big end goes to the manifold, the other two go to the can and HVAC respectively.
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue May 13, 2014 8:53 pm    Post subject: Reply with quote

Thanks, Aaron. Sometimes you're awesome. Wink

Good news: I found the check valve in my stash of original parts and it still works. And the hose matches up to one of the ports on the back of an LS3 intake. Thumbs up I guess I'll just cap the line for the heater coolant valve.

Bad news: I found the shorted connector and it was at the a/c clutch. I even labeled it as, "shorted". That means the wiring for a/c controls might be damaged and I am a person that needs my air conditioning!
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Mon Sep 29, 2014 6:39 pm    Post subject: Reply with quote

Another "What is this and where does it go?"

What is that grey connector for? The connector terminates close to alternator on a 2.8L multi-port engine and comes from a fusible link at the main power distribution lug on the side of the radiator core support. It's actually 1 of 2 wires from a 2-way split at the fusible link. Other wire goes to C100 and I think it is switched B+ for fuse panel.

The alternator connector you see has it's own wire and fusible link that goes to the same distribution lug.



Last edited by QwkTrip on Tue Sep 30, 2014 9:03 pm; edited 1 time in total
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Mon Sep 29, 2014 9:44 pm    Post subject: Reply with quote

Headlight module?

Could also be the for the MAF relay if it was mounted to the core support rather than the firewall.
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue Sep 30, 2014 8:16 pm    Post subject: Reply with quote

Thanks for the guesses. I'm still stumped though.

I found my old MAF relay and it has it's own power feed through an inline fuse, so it's not that. I also traced the headlight module feed wires back to the two fusible links that power the fuse block. I traced wires and did a bunch of Ohm checks tonight and I may not know what it is but I know what it is not.

Not fusible link for cooling fan.
Not fusible link for headlight doors module.
Not fusible link for headlight switch.
Not fusible link for alternator.
Not fusible link for ignition switch.
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QwkTrip
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Joined: 17 Feb 2004
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Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue Sep 30, 2014 9:19 pm    Post subject: Reply with quote

I want to think that the fusible link is for the blower motor relay (red wire) but the location doesn't work out.

On the other hand, this jumper (white wire) off the distributor coil is the same type of connector and is close to the blower motor connector. It seems natural to plug it in but that doesn't jive with the wiring diagrams I have, and the wire size is small. If this connector didn't go to the blower motor (red wire) then where did it go?



Last edited by QwkTrip on Tue Sep 30, 2014 9:31 pm; edited 1 time in total
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chevymad
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Joined: 11 Jan 2004
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1987 Pontiac Formula

PostPosted: Tue Sep 30, 2014 9:26 pm    Post subject: Reply with quote

This is what Prodemand says is connected to the battery distribution lug.

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chevymad
Master B


Joined: 11 Jan 2004
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1987 Pontiac Formula

PostPosted: Tue Sep 30, 2014 9:27 pm    Post subject: Reply with quote

The white wire at the coil is a tach output wire for diagnostic equipment. It isn't connected to anything on the car.
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue Sep 30, 2014 9:38 pm    Post subject: Reply with quote

Dude, you are the man! Thumbs up

You have no idea how bad the wiring diagrams suck in my Chilton's manual. Well, maybe you do.... but in that case you know I didn't have a prayer of sorting this out.
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chevymad
Master B


Joined: 11 Jan 2004
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1987 Pontiac Formula

PostPosted: Tue Sep 30, 2014 9:39 pm    Post subject: Reply with quote

Lucky for you I saved the user/pass from work on my phone... lol
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue Sep 30, 2014 9:39 pm    Post subject: Reply with quote

Hmm... interesting.

I would start looking at the blower relay/underhood light circuit. It is a high-gauge red wire fed by a fusable link that has a gray connector inline.

It's got no business being over by the alternator, but I've got no better ideas. Laughing
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue Sep 30, 2014 9:51 pm    Post subject: Reply with quote

Well, that is the wire. I don't know how it got there but I'll just move it! I never had an underhood light.

So while you've got those wiring diagrams open.... Very Happy

People keep talking about a fusible link for headlight relay on left front of engine bay. I don't know what they're talking about. Is that a Camaro thing only? As far as I can tell I don't have any relays like that. I have a headlight doors module and a light switch on the dash. Everything is hard wired through those parts with no external relays.
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Tue Sep 30, 2014 10:04 pm    Post subject: Reply with quote

Foglight cars had a foglight relay. That was pretty much the only relay GM used in the lighting system. It is an incredibly poor design.

I think the door module on Birds is basically a DPDT relay, but meh, technicalities.

Not all cars got the underhood light, but all cars were wired for it. If you didn't get the light then the two ends of the connector are just plugged into each other and the wire heads on to the blower relay.
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Tue Sep 30, 2014 10:44 pm    Post subject: Reply with quote

Thanks, guys. This is really helpful! That was one of the last mysteries about my car wiring. I think I've got a handle on the rest of it. Cool
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QwkTrip
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Joined: 17 Feb 2004
Posts: 3942
Location: Peoria, IL

1989 Pontiac Firebird

PostPosted: Sun Oct 04, 2015 7:23 pm    Post subject: Reply with quote

Got another one....

This 30A circuit breaker was sitting loose in a pile of parts. I have no idea why I removed it and where it came from. Anybody know?

I swear that sometimes I am my own worst enemy. I can't imagine why I ever thought it would be a good idea to remove this!

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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Sun Oct 04, 2015 7:27 pm    Post subject: Reply with quote

Usually only see those breakers for things like power seats or windows.
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