I'm working through my list of issues with my 1990 300SEL. She runs like a champ now, but it's hot out so time to work on the Climate Control...

I've already replaced the strip fuse with a brand new one and confirmed that it doesn't have any cracks and is solid with a volt/ohm meter. Also checked the leads at the bolts that hold down the strip fuse (Dremel wire brush + dielectric grease). My test for power at the climate control is whether the night lights come on. I have 3 units to work with. I tested bulbs (6) for all 3 units. When I turn the ignition to position 1 and turn the headlight knob to position 1, the little bulb for the ash tray comes on but nothing on the Clima unit. What else can I do to test and get it running?

Thanks,
AL

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio