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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Tue May 13, 2014 8:12 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue May 13, 2014 8:17 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue May 13, 2014 8:20 pm Post subject: |
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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: 5474
1987 Pontiac Formula
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Posted: Tue May 13, 2014 8:22 pm Post subject: |
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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. |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Tue May 13, 2014 8:26 pm Post subject: |
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chevymad wrote: | Amazing what a guy with a working memory can do. |
That's okay, I'm losing it fast enough as it is,
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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue May 13, 2014 8:53 pm Post subject: |
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Thanks, Aaron. Sometimes you're awesome.
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. 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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Mon Sep 29, 2014 6:39 pm Post subject: |
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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 Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Mon Sep 29, 2014 9:44 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue Sep 30, 2014 8:16 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue Sep 30, 2014 9:19 pm Post subject: |
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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 Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Tue Sep 30, 2014 9:26 pm Post subject: |
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This is what Prodemand says is connected to the battery distribution lug.
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Tue Sep 30, 2014 9:27 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue Sep 30, 2014 9:38 pm Post subject: |
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Dude, you are the man!
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 Posts: 5474
1987 Pontiac Formula
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Posted: Tue Sep 30, 2014 9:39 pm Post subject: |
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Lucky for you I saved the user/pass from work on my phone... lol |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Tue Sep 30, 2014 9:39 pm Post subject: |
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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. |
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QwkTrip 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue Sep 30, 2014 9:51 pm Post subject: |
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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....
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 Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Tue Sep 30, 2014 10:04 pm Post subject: |
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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 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Tue Sep 30, 2014 10:44 pm Post subject: |
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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. |
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QwkTrip 11sec Club
Joined: 17 Feb 2004 Posts: 3942 Location: Peoria, IL
1989 Pontiac Firebird
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Posted: Sun Oct 04, 2015 7:23 pm Post subject: |
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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: 5474
1987 Pontiac Formula
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Posted: Sun Oct 04, 2015 7:27 pm Post subject: |
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Usually only see those breakers for things like power seats or windows. |
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