FYI FORD MustangSteve's Ford Mustang Forum / Bypass pink resister wire with old voltage regulator wire

**Posted by RTM** 8/04/2024 8:29 AM

Since I have a one wire alternator the voltage regulator circuit is eliminated. So I have the yellow wire that is unused. My plan is to unplug the pink resistor and use this yellow wire for my constant 12V needed to run my progressive distributor.

I still have the red wire that is for the voltage gauge to use on the aftermarket autometer voltage gauge. This red wire comes off of the solenoid. Am I thinking this out correctly?

**Posted by John Ha** 8/04/2024 9:18 AM

The red wire and the yellow wire, taken separately, always have power applied to them - even with the key off. Is that really what you want?

**Posted by RTM** 8/04/2024 9:35 AM

John Ha wrote:
The red wire and the yellow wire, taken separately, always have power applied to them - even with the key off. Is that really what you want?

The yellow wire is not being used. It has no power connected to it. In the picture you see the yellow wire with the black wire. The yellow is for the factory gauge, I’m not using factory’s instruments. The black next to it would connected to the starter solenoid and would power the voltage regulator, which I’m not using because of the one wire alternator and the black wire will not be connected to anything so no power at the voltage regulator connection.

I need to review the wiring for the autometer gauges but I believe I need 12V from the battery and then another 12V from the key on position.

**Posted by John Ha** 8/04/2024 9:49 AM

If you're using the part of the yellow wire that comes out of the firewall, and you are connecting at the bullet connector on the left side of the engine bay (with the other end connected to the 16 red/green stripe under the dash), then yes, that should work. I was looking at the other "side" of the yellow wire that's connected to the wire between the alternator and battery/solenoid. As long as the latter connection is out of the circuit, you should be fine.

**Posted by RTM** 8/04/2024 9:59 AM

Thank you John.

**Posted by BobE** 8/05/2024 6:35 AM

RTM - I'm not sure if you it but I emailed you the 66 Mustang wiring diagram.
Make sure you've got the correct yellow wire. A yellow wire is used in several circuits.

Last edited by BobE (8/05/2024 6:40 AM)

**Posted by RTM** 8/05/2024 7:11 AM

BobE wrote:
RTM - I'm not sure if you it but I emailed you the 66 Mustang wiring diagram.
Make sure you've got the correct yellow wire. A yellow wire is used in several circuits.

You did and I’ve checked this wire a million times and reviewed the drawings a million times. I used my meter to confirm which wires are which.

**Posted by True74yamaha** 8/05/2024 10:35 PM

Yellow black goes to alt light and green/ red stripe is the alternator exciter wire. Dunno if you need an exciter wire for the alternator that you have. Just thought I'd throw this out there

Last edited by True74yamaha (8/05/2024 10:36 PM)

**Posted by RTM** 8/06/2024 3:43 AM

True74yamaha wrote:
Yellow black goes to alt light and green/ red stripe is the alternator exciter wire. Dunno if you need an exciter wire for the alternator that you have. Just thought I'd throw this out there

The black/red and white in the alternator harness are not used. I may use these extra wires to power the cool guy fan controller. I’ll mount the controller were the voltage regulator would normally go.

**Posted by mustang stu** 8/12/2024 7:53 PM

You can use the pink resistor wire to activate a relay to get your 12 volts to the distributor, works well, I carry a long wire with 2 clips to run from the battery to the distributor, in case that relay would fail. mustang stu

**Posted by Mochaman** 8/14/2024 1:01 AM

I would not recommend using the pink wire for anything. I almost burned my car up using it for a 12 volt source. It is a time bomb.

**Posted by BobE** 8/14/2024 7:04 AM

Mochaman wrote:
I would not recommend using the pink wire for anything. I almost burned my car up using it for a 12 volt source. It is a time bomb.

I agree, find a 12v source. The resistor wire will drop the voltage to like 9v.

**Posted by RTM** 8/14/2024 7:21 AM

BobE wrote:
Mochaman wrote:
I would not recommend using the pink wire for anything. I almost burned my car up using it for a 12 volt source. It is a time bomb.
I agree, find a 12v source. The resistor wire will drop the voltage to like 9v.

I’m not using the pink resistor wire for anything. I’m bypassing it.