Strange Fault
I have a fault not experienced before.
On a 1989 300 GD when no electrical power is being used the the temp gauge reads normal, when you turn on any electrics even the radio the temp gauge goes up, so on a wet night with all lights wipers and radi on the temp gauge reads hot, stop and turn electrics off it reurns to normal, any clues.
but there might be a problem with the voltage stabiliser for the instruments if there is one.Sometimes it is on the back of the instrument itself.Try changing the complete unit.
in the past i have had similar problems and sometimes if you put an extra earth from the instrument body to the body, a really oversized one it has stopped the problem.
please note bill sometimes, not always!!
however it will take you 5 mins and b*gger all money so have a try.
regards mark
Thanks Mark, I have spent the day working through thr complete electrical loom looking for a bad earth or power leakage/crossover.
I realised also that another fault developed at about the same time and that was that the interior lights were miss-behaving, ie not coming on when door opened, only coming on when lights were on but not continous, also one parking light, the right one was dimmer than the other but not always and the intermittent wipe had stopped working.
My investigation found, up under the dash, the control box for an alarm I followed the wires from it to various points ie door switches ignition switch, via a relay to the battery and a complete mass of wires through the bulk head to the engine bay where they had been chopped off and left bare, in another life it must have had an alarm and for what ever reason some one had chopped half of it out.
Now I have removed it all and replaced one relay and timer on the main fuse board all the faults have dissapeared as if by magic.
A good days work, and thanks to you who thought about it.
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