Thermal locking front diff question

[Twisted Steel Performance]

Hi everyone, I am having a little trouble getting the front diff to lock, ( 91 GMC K2500)I know there is a broken wire somewhere in the wiring for the thermal plunger in the front diff and it will lock sometimes and other times it doesn't lock....

My question is.... my thermal plunger has 2 black wires going to it, if I connect new wires to it and feed 12v to it with a toggle switch will it matter witch wire I connect the 12v to???

I have a posi lock coming but it will not be here before my trip and I would like to be able to use the 4x4 if needed....

 

[THEFERMANATOR]

They aren't polarity sensitive, so hook em up however. When you put power to it, all you are doing is engaging a heating element. And the intermittent apply is a common problem with the thermal actuators.

 

[Big T]

Hi everyone, I am having a little trouble getting the front diff to lock, ( 91 GMC K2500)I know there is a broken wire somewhere in the wiring for the thermal plunger in the front diff and it will lock sometimes and other times it doesn't lock....

My question is.... my thermal plunger has 2 black wires going to it, if I connect new wires to it and feed 12v to it with a toggle switch will it matter witch wire I connect the 12v to???

I have a posi lock coming but it will not be here before my trip and I would like to be able to use the 4x4 if needed....

The thermal actuators are prone to failing. Don't jerry rig it. Switch to the later model motorized actuator. You will not regret it.