The 3rd light power does not come from the light monitor unit. I really believe
MB knew the wires
would break at the right hinge so they ran the power direct from the stop light
switch. That is why
the switch has two plugs on it. One pair of wires goes to the light monitor and
the other pair goes
to the 3rd light.
Check the wires at the hinge again. They break about 2" past the hinge towards
the front of the car.
Pull the accordian rubber out of the body.
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