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It sounds like an issue with either the switch itself or something on the parking brake lever pressing on the switch in a way that it works backwards, as in making contact when the lever is released. Other than checking the parking brake lever for something out of place that would be making the...

I agree, it does look foolproof. Obvious grounding eye is obvious, for one :p I've never messed with the parking brake light switch and I hope I don't have to for awhile! What happens when you press the brake pedal while the light is on? I'm wondering if something else is backwards with the...

Are you sure you got the right switch? I'm not sure if similar parking brake levers on other trucks, such as the HMMWV, have a switch that's backwards from the M44 family of vehicles. I'm assuming it's this part here which should be the same as those USAF deuces that were built with...

The parking brake light is supposed to be off when the parking brake is released. If it's on or flashing and the parking brake is released, it means there's a problem with the brake system, probably a leaky hydraulic circuit. In your case, maybe you have the wires reversed somewhere?