1966 Mustang ammeter problem - Mustang Evolution

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Old 03-25-2012, 05:29 PM   #1
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1966 Mustang ammeter problem

I finally got around to trying to fix the ammeter. I bought a new ammeter gauge and installed it, but nothing. Wiring seems correct, but not sure where the yellow wire ends up after the firewall. Wiring diagram states it should go to the alternator. I just can't trace it.

Does anybody have any suggestions on what I should do to troubleshoot it.

Thanks.
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Old 03-30-2012, 09:12 PM   #2
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Re: 1966 Mustang ammeter problem

The Yellow wire turns into a Black/Yellow wire once it goes through the bulkhead connector (center one, not the one above the master cylinder.) The Black/Yellow wire goes to the battery side of the starter relay, and to the Batt post on the alternator. If the battery is connected, you should be VERY careful probing it, it has full battery voltage all the time. There are 2 connectors before it gets to the alternator. One is a single wire, and one is the 3-wire connector off the alternator. You could disconnect the battery and check the continuity through those connectors. Whatever you do, be REALLY careful when the battery is connected. Wiring diagrams are available from all the vendors, they can just be a little tricky to read. Hope it helps.
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Old 03-30-2012, 09:54 PM   #3
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Re: 1966 Mustang ammeter problem

Thanks. That helps a lot.
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