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Thread: Mustang voltage regulator hot
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04-10-2024 #1Registered User
- Join Date
- Dec 2018
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- 26
Ford used 2 different wiring setups on the 1g alternators with external regulators, depending on wether it had a warning light or an ammeter. The way you have it is correct for an ammeter setup. For a warning light setup, a goes to the starter solenoid battery hot, I comes from the ignition switch through the warning light (don't use a LED for this and put a resistor parallel to the bulb so it'll charge if the bulb blows), f goes to field or fld on the alternator and s goes to stator or sta on the alternator.
Most aftermarket regulators can be swapped interchangeably, but Ford did use a separate part number depending on how it was wired originally, I'm not sure if your regulator is universal or not, that's something to check.
Even if you don't run a light, the way you have it should work provided the regulator can work that way.
Either way it should not be getting warm with the key off, that shows a current draw through it which will kill the battery.