OK, so still no power to the compressor.

My next step is to hotwire the compressor to ensure it engages. I expect it will.

After that, I guess I would want to try and bypass the relay to see if the starter is disengaging it. Like I said, I have swapped both ice cube relays for known good ones with no effect.

The other thing is that I am also not getting any voltage across the fuse that feeds the compressor. If the starter was disengaging the relay, wouldn't I still see voltage at the fuse? Not sure how the circuit works here.....

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT