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Okay. I was just under the hood with a voltage reader and some jumpers. Here's what I discovered: I think it is the low fan speed that is not working, because it is fairly hot here in Arizona right now and they do not turn on at all with the a/c running and the temperature below 92 C. Yesterday, I did hear the fans running when the coolant temp went above 92 C, but they sounded to me like they were running in low.
There is voltage coming out of one of the pigtail wires on top of the receiver dryer. I jumpered the pigtails (1st picture) and, with them jumpered, measured the voltage at the top terminal for the resistor behind the front left headlight. There is no voltage there.
When I tapped into the 30 amp strip fuse toward the firewall (2nd picture) and connected that directly to the top terminal of the resistor (3rd picture), the fans came on. So I think the resistor is okay. This makes me wonder whether there is a problem with the wiring that leads to the top terminal of the resistor. I am presuming that the wiring goes from the 30 amp strip fuse directly to the resistor terminal. Please correct me if I am wrong.
Is there a relay between the 30 amp strip fuse and the resistor? I tried to trace the wire from the strip fuse to the resistor, but it is bundled and tie wrapped with a bunch of others.
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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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