Behind Mkiii Instrument Cluster

[SteveLS400]

Fortunately, I have not had to remove the instrument cluster/dash from a MKIII. For those that have, may I ask the following

Is there only 1 earth wire to the unit or are there multiple earths?

If only 1, does it affect all gauges? Is this wire black in colour?

If there are multiple earths, which affects the temp gauge? What colour is it?

[alanr]

Steve,

I don't know how much use this is to you, if at all, but on the wiring schematics for a Mk IV there are two earths shown. One is direct from the internal CPU, and the other is from the negative side of all the panel lamps. Both are colour coded black/white. The Mk IV instument panel is not interchangeable with a Mk III, but tends to follow many of the same basic principles and construction.

You need to bear in mind that wiring schematics are exactly that - a theoretical circuit layout - and the reality of the wiring often appears to be totally different. In the schematic the instrument panel is devoid of anything downstream of the CPU, which means all gauges and warning captions.

I have tried to attach a copy of the relevant schematic, but am not sure how successful I have been. If you want a copy of all the wiring schematics for a Mk IV, then drop me an email and I will forward them to you.

Regards,

Alan