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E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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Old 06-18-2016, 02:56 PM
Dead.pianist Dead.pianist is offline
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Mein Auto: 1984 325e
84 325e blowing fuse 19

Hello everyone. I have been lurking around here for a bit and learned a lot of useful information, finally registered today and am looking forward to learning more. My problem is relatively simple, I believe, and although I think I know the steps to take to remedy it, I am hoping someone can help me avoid wasting time tearing into wiring harnesses that don't apply to my issue. The problem is as follows:

My 1984 325e is eating fuse 19 repeatedly. This fuse protects the auxiliary radiator fan, power mirrors, and interior lights. I couldn't care less about the latter two not working, but I am concerned about the aux fan for obvious reasons. I have isolated the problem to a likely short to ground, but now I need advice regarding how to best locate the short. Because I am a total novice at troubleshooting electrical problems, let me run through the tests I've done so far, briefly, in case I've made any blatant diagnostic errors:

First I took the aux fan switches off the circuit, fuse blew anyhow. This tells me it is not the fan that is overloading the fuse.

Next I removed the mirror switch and found that I had continuity between terminal 2 (ground) and ground (g200) but also between terminal 4 (power) and ground. (Not good, correct?) This test was conducted with a fresh fuse and an ohmmeter. With the fuse removed, there is not continuity between 4 and ground. This indicates that the short is not between the load side of the fuse and the mirror switch, but before the fuse panel... right??

To confirm, I removed fuse 19 and using an ohmmeter at the fuse box, got a reading of 7.4 ohms between the supply side of fuse 19 and ground. So I am thinking that this indicates a short to ground... Am I on the right track?

Assuming I am, where is the most likely area to inspect looking for a short? Would it be around the fuse panel, as I suspect, or more in the neighbourhood of c405/s501, I.e. the load side of things?

Because of my unfamiliarity with electrical circuitry, I'm sort of shooting in the dark here, or at least it sure feels like it... I'm very open to corrections. What do you all think?

Last edited by Dead.pianist; 06-18-2016 at 02:57 PM.
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Old 06-22-2016, 11:35 AM
Dead.pianist Dead.pianist is offline
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Mein Auto: 1984 325e
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Old 06-22-2016, 06:38 PM
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hornhospital hornhospital is offline
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