What I was trying to figure out is what a high and low reading represents.

I know <1 is good. So when they are burning out they read high and when the die they read 0?

Like I said in an earlier post, to test the relay I jumped the 1 & 3 on the 4 wire plug and the light came on. I'm not sure what the next instruction is telling me to do.

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1985 300CD, CA
172 Anthrazitgrau/Palomino 154

1985 300TD, CA
040 Schwarz/Palomino 154/3rd row seat

1985 300TD, CA
473 Champagner/Palomino 154/Cargo cover