Need help with Alternator

Notch8022 · Jun 15, 2009

Need help with going back to stock set for mustang alternator. I have an old school alternator on my car with an after market March bracket. I put a new battery, external votage regulator, and replaced the alternator with the exact same old school alternator only to find that one I fire up the car my voltage is showing 12. Someone has spliced in new plug in for the alterator. I have only three wires going to the alternator and would like to go back to factory hood ups. Could the gage be off?

jrichker · Jun 15, 2009

Not likely. Spend a few $$$ and buy a DVM with an analog bar graph as part of the display. You'll need to to find and fix many other problems.

No info about your car's model year, EFI or carb, no mods listed. Makes it hard to troubleshoot when we don't know what you have.

Therefore, no clue as to which wiring diagram you need. The wiring changed several times between 79 & 95.

That's why it is a good idea to use the sig under the user control panel (User CP) option. It allows you to post your car year & mods, which help greatly when troubleshooting things. No, it is not there for us to snoop and see any "Secrets" you have hidden away under the hood. Be a good stangnetter and update you sig for future reference & don't keep us guessing.

Notch8022 · Jun 16, 2009

I have edited the sig. Thanks.

Notch8022 · Jun 16, 2009

I am running stock efi motor.

jrichker · Jun 16, 2009

The original alternator used an internal regulator. See the diagram below for the proper wiring.

Diagram courtesy of Tmoss & Stang&2birds

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