I repaired my front end. 1985 300SD, needed brakes, saw other problems that led to replacing upper control arms, lower ball joints, calipers, bearings...

Had the car all back together and now noticed when I start it, the red light that usually pops on (to the left of the glow plug indicator) is not lit.

Last time this happened, I brought it into the shop that replaced my alternator and they said the replacement showed a bad diode...

So, I am wondering if those little copper contacts in the front axle stubs need to "contact" the hub cup. Or perhaps the wire used to plug the vehicle in for preheating the engine in really cold weather, perhaps its wire is exposed and touching metal....

I plan to start my car and take the negative cable off the battery to see if the vehicle keeps running or not. If it keeps running, I guess the indicator light is burnt out! If the engine stalls, then my alternator is bad again...

But the contacts in the front wheels, I would like to know if I needed to prep them by over bending the pre bend in the contact, forcing it to rub the inside of the cap....

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1985 300SD