Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

need a wiring diagram

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Old Mar 9, 2004 | 04:55 AM
  #1  
redrummer's Avatar
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From: Bethlehem, Ga
Car: '88 Trans Am GTA
Engine: 5.7L L98
Transmission: 700r4
Axle/Gears: 3.27 Aussie 9 Bolt
need a wiring diagram

Finally! I think I've got the problem nailed. I was going over some pages from the GM service manual and came across a test I decided to do anyway. The instructions say that if I'm getting spark in the coil wire, to check and replace the cap, rotor, ignition module, etc. Well, I did, and all that stuff is brand new and good to go. I'm getting spark there, so I figured it was something else.
Well, it also says that if I'm not getting spark at the coil wire, to test the "B" terminal (tach lead) in the grey connector on the coil for voltage. If it's reading over 10 volts with the key on, you're good. Well, I'm reading .01 volts every time I test it, so something's definitely going on there. It says to replace the connector or repair the break, etc. It's a wire I've already spliced together once before and I tested continuity from the connector to the splice and it's good. My only guess now would be that it's broken somewhere between there and wherever else it connects.
The only problem is, I don't know where else it connects. Does anyone have a wiring diagram with this on it? I'm assuming the wire goes to the tach (naturally), but with my luck it'll go somewhere else.
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Old Mar 9, 2004 | 09:27 AM
  #2  
Trickster's Avatar
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
It goes to pin 11 on the instrument cluster connector for the tachometer.
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Old Mar 9, 2004 | 05:49 PM
  #3  
redrummer's Avatar
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Joined: Jun 2000
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From: Bethlehem, Ga
Car: '88 Trans Am GTA
Engine: 5.7L L98
Transmission: 700r4
Axle/Gears: 3.27 Aussie 9 Bolt
You wouldn't happen to have a picture or diagram of that, would you? I have no idea what I'll be looking for.
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Old Mar 9, 2004 | 06:16 PM
  #4  
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From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
tach wiring diagram

Do I have it? YEP!!!!

Will I send it to you?............UH!! YEP!!!!

Had to think about it for a moment!
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Old Mar 9, 2004 | 07:03 PM
  #5  
redrummer's Avatar
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Joined: Jun 2000
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From: Bethlehem, Ga
Car: '88 Trans Am GTA
Engine: 5.7L L98
Transmission: 700r4
Axle/Gears: 3.27 Aussie 9 Bolt
edited

Last edited by redrummer; Mar 9, 2004 at 07:11 PM.
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Old Mar 9, 2004 | 07:10 PM
  #6  
redrummer's Avatar
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From: Bethlehem, Ga
Car: '88 Trans Am GTA
Engine: 5.7L L98
Transmission: 700r4
Axle/Gears: 3.27 Aussie 9 Bolt
Thanks dude!
For clarification:
The red is where I started. I can't go any further with it. The entire ignition system is brand new from the ground up.
The yellow I decided to test just for the hell of it and if you follow the line, you see where I end up. I can only assume that the tach lead it's talking about is the one on the coil. Agree?
I'm thinking of doing the rest of the tests on this page just to be on the safe side.
Attached Thumbnails need a wiring diagram-c4.jpg  
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