Get this...unplugged the air pump, and the fuse doesn't pop anymore. Not even on the same circuit, weird. No MIL, so guess the pump stays unplugged in favor of heat and reversing lights. Harness survives its second headgasket change!

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro