Robert sneed
Member
I have a 3 wire alt, and recently upgraded my wiring harnesses with a kwikwire wiring harness. Im stumped with this alt hook up not charging. This is how it’s hooked up, does anyone notice anything wrong? Thanks in advance.
Alt hook up
- Thread starter Robert sneed
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How it's wired depends on whether you have a factory alternator or idiot light. You can see how they are wired in the PDF here
https://www.7173mustangs.com/thread-alternator-and-regulator-wiring?pid=320622#pid320622
https://www.7173mustangs.com/thread-alternator-and-regulator-wiring?pid=320622#pid320622
Robert sneed
Member
It’s a factory alt, but there’s no dummy light
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- 1971 Mustang Sportroof M code
There is no connection between the stator terminals on the alternator and voltage regulator when you have the factory ammeter. A wire (light green with red stripe) is connected to the stator terminal on the regulator and comes from the ignition switch. This wire is what energizes the regulator and alternator. There is no wire connected to the "I" terminal on the regulator when you have the factory ammeter.
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- 71 Mach 1
71 XR-7 hardtop
71 Country Squire
65 hardtop
You didn't state what year your car is, but they were mostly the same through the three years. Here's the 71 charging/starting diagram with tach. The alternator is on it's own sub-harness with the only connection to the main harness being through the exciter wire (904).
71alttachwiring.pdf
71alttachwiring.pdf
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