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Bulkhead connector/ test for power C100 wires

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Old Oct 15, 2018 | 02:10 PM
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Car: 1983 Z28 T-tops
Engine: 350 GM Crate
Bulkhead connector/ test for power C100 wires

Hi all,
i have no lights or cabin power. How do I backtest the c100 connections with a voltmeter? It looks like I have no fusible links at the starter, wires soldered together etc. Car is a project 1983 carb with a crate 350, runs great but only has brake lights and rear blinkers. The stereo turns on but is all status and the wipers work if that is any indication. I have the C100 diagram for my 1983 but not sure how to test it. I also pulled the switch out from interior to test. Thanks!
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Old Oct 15, 2018 | 04:24 PM
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Re: Bulkhead connector/ test for power C100 wires

Pull the fuses out and see if there is power on the buss side? Then continuity on the fuses them selves
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Old Oct 15, 2018 | 06:39 PM
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Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

How do I test power at the starter first? I put my voltmeter in both posts and ground to the body and it reads zero. Battery reads 12.96 not running. Thanks!
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Old Oct 19, 2018 | 08:18 AM
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Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

ok I have measurable power at starter and one pin on the c100. Should I have more than one always hot at the c100?
I have power at some fuses but nothin gat the CTSY! Help, that must be my issue circuit. fusible link? I can't tell by looking at them so need to test continuity to c100 I assume. I have a voltometer but need to educate myself how to test for continuity. Ohms setting research in my future.
How do I test the fusible link @ the starter?
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Old Oct 19, 2018 | 12:01 PM
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From: Massachusetts
Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

Fusibles tested ok, and I have power at the firewall on these 2 ports only, the pink and red I am holding in the attached.


If I have no power at CTSY I guess I need to chase from the firewall in cabin side. Are place I should look first as to why no CTSY power, lights etc

?

Thanks all!!

Last edited by Dholland17; Oct 19, 2018 at 12:21 PM.
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Old Oct 19, 2018 | 12:07 PM
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Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

These are my guides but I need help here for sure...

http://austinthirdgen.org/mkportal/m...ody_wiring.gif

http://austinthirdgen.org/mkportal/m..._continued.gif
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Old Oct 19, 2018 | 01:31 PM
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From: Massachusetts
Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

Using this as well.

So looks like I have no power from the firewall on plugs F4 and G5. Need to back track those now...
Fun fun fun…

http://www.austinthirdgen.org/mkport..._1985_C100.gif
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Old Oct 19, 2018 | 04:07 PM
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From: Massachusetts
Car: 1983 Z28 T-tops
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Re: Bulkhead connector/ test for power C100 wires

Ok, success. G5 wire was out, looks like it disconnected somewhere along the firewall. Where does that connect? It is always hot so should I splice it in-line with the A4 wire? When I did that as a test the headlights and everything worked .
I just want to make sure I juice that G5 wire from the correct source.
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Old Oct 19, 2018 | 08:56 PM
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Re: Bulkhead connector/ test for power C100 wires

A4 and G5 both run back to the starter. You cannot connect them together. It sounds like you have a fusable link burned out
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