intermittent loss of lots of dashboard electrics

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ndh
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intermittent loss of lots of dashboard electrics

Post by ndh » Sun Jul 28, 2019 1:52 am

The other day rather a lot of electrics failed at the same time (voltage gauge, fuel gauge, temp gauge (but not oil pressure gauge), indicators (but not hazards), tacho and overdrive switch) with gauges at far left zero position. After a short interval and all of a sudden they all sprang back to life at the same time and worked for a few days but have now all failed again. My blind guess is that this might be an earthing fault. Is there an earthing wire that would apply to all of these which should be checked and cleaned up? Of some other single point of failure which would affect all of these things but apparently nothing else (well, it could affect other things but nothing else i have notoced / found yet)?

Thanks



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intermittent loss of lots of dashboard electrics

Post by philhoward » Sun Jul 28, 2019 5:57 am

Usual suspect is the “Ignition Control” fuse - or indeed the fuseholder itself. If a 6-series it could also be the ignition relay but the fuse would be the first on the list.


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intermittent loss of lots of dashboard electrics

Post by scimjim » Sun Jul 28, 2019 9:49 am

Wiring diagram here Nick. To confirm it’s the igniition control fuse, check your reverse lights. If it fails again, note that it supplies the radiator fan, so don’t get caught in traffic :D


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ndh
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intermittent loss of lots of dashboard electrics

Post by ndh » Sun Jul 28, 2019 2:12 pm

Thanks, will have a look.



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intermittent loss of lots of dashboard electrics

Post by Oldconn » Sun Jul 28, 2019 3:06 pm

You might also search behind the instrument panel which includes the rev-counter and the speedometer. Under there are several multi-pin plugs which link sections of the wiring harness. If these have ever ben wet (leaking windscreen seal for example) , they are likely to be oxidised and making intermittent contact-- don't ask me how I know! Pull them apart and inspect the pîns , try a cleaning spray, or replace with new plugs.


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