yevgenievich
I'm Awesome
Surprisingly could not locate all the needed info on front axle actuator that easily. 99+ factory used a switched ground to activate while prior thermal used a switched 12v. Not until dorman tech support shared their upgrade harness instructions did I confirm that the empty pin on 99+ is actually to use switched 12v. GM must have intended it to be easily backwards compatible. Except also the need for a spacer(old socket worked perfect). After testing on the bench, it is now installed. Just needed to move the pin over. And run ignition switched 12v from tcase switch.
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