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sidstang

Need help with Alternator Wiring

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Hi,

I have a 69 Mustang Coupe with a 302 engine. I got extra parts from different cars when I bought it and I'm not sure how this should be hooked up. I have 3 wires coming off the alt. 1st is a thick black wire that comes off the alt and goes to the front headlight harness and then there's an orange one that I think goes to the field on the box on the firewall. And another wire-white or yellow, goes from the alt and it winds in through the wire harness through a rubber wire holder and goes to a ground. It doesn't connect into the harness. When I hooked them up and fired the engine the wire that goes to ground totally melted and burned off. Does anyone have pics of their wiring or can telll me how the wires are supposed to be hooked up? I have no tach on the dash. Is it possible that the wire that burned wasn't supposed to go to ground? And maybe was supposed to be for tach? 

Thank you for your help!

Sid

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See if any of the attached helps. Since your car was not wired or equipped with a factory tach, you will only have 3 wires coming off the alternator.

 

FIELD > which runs through the 3-pin connector of the wiring harness over to your voltage regulator to the "F" terminal

BATTERY> which also runs through the 3-pin connector of the alternator harness and connects to the +side (battery side) of the starter solenoid on the fender apron.

GND > This is ground and will also run through the 3-pin connector

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post-14105-0-88950200-1430603399.jpg

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SidStang:

What you're describing is the alternator to headlight harness plug for a non-tach dash.  That plug is a three pin affair that routes as follows:

Black/red is ground

orange is VR signal and goes to voltage regulator

Black is main power and goes to alternator and battery solenoid connector.

 

Now then...the tach plug is a four pin affair:

black/red is ground

white/black goes to voltage regulator

orange goes to voltage regulator

black is main power and goes to alternator and battery solenoid connector

 

In both cases, there's a yellow wire on the voltage regulator that is also tied to the main power.  The tach harness has a four pin voltage regulator; the standard harness has a three pin voltage regulator.

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Thanks for your replies. The yellow wire was connected to the ground. The pin plug was missing on my wire harness and the setup to the alt has 3 holes- 2 on top and one on the bottom. The yellow wire burned completely and so I cut it off. I started the engine and it ran fine and the alt gauge was working fine. So I guess it's ok the way it's setup now. If anyone has any input, please reply.

Thanks!

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That yellow wire needs to go to the voltage regulator...

Thank you for your help, Midlife. I got caught up in another problem with interior colors, so have put this issue aside. I will take a look at it tonight again and see what I can do to hook this up the right way. I may be missing the ground wire......

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