Gears, I get it. I have a theory as to what happened. The contact resistance may have been so high that the switch heated up and cooked the connector. Maybe it's smart to stop unless you're ready to replace the cable and connector too. I bet the connector is roasted and requires at least one new socket/pin. I'm not sure they can be individually replaced.

Did you run the button directly to the solenoid? Nice button by the way. I tried but never got mine to work reliably. Either my wiring gauge was too small or my switch didn't have a good enough contact. Where did you get the button?

Also I like the location of your switch...I couldn't find a good place to fit mine in.

I actually still want to install a button permenantly for a backup.

I wouldn't call it quitting. You've just bought yourself some time to come up with a fix at your leisure.

Ps: make sure your wiring is safe. If you are running a hot 12V wire (I suspect you are) make sure it is safely routed so it won't chafe anywhere on the body or else you will have a helluva fireworks show when it does. Vibrating diesels have a knack for rubbing through wiring insulation if forgotten about.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 190k miles
97 C280 150k miles