If you find C146 on your W126 SD post a photo. I'm still looking for it. I cannot find any plug with a vi/w wire.

Tonight my remote switch stopped working. I can still start the car by jump wring the screw terminals on the firewall no problem.

I decided to pull my ground strap and give it a good inspection and cleaning. It was pretty dirty and I got the terminals and washers nice and shiny. No luck. Same click issue with the key and remote switch.

As for the remote starter button my guess is the 10' of #16 wire is too much resistance a long with the fuse and switch contact resistance. The 1" jumper wire (a banana Jack) works fine on the screws.

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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 170k miles
97 C280 147k miles