Hot lights

whenever I switch my lights on - sidelights, or dipped/full beam - the temp gauge goes up. goes up a little bit for sidelights and even more, as in into the red, when the headlights are dipped or full. I'm guessing there's a dodgy earth somewhere and have checked the chassis and gearbox earths that go to the battery, as well as the earth for the spotlights.

any other earth points that I don't know about? or other suggestions? I shat myself the other night when I was driving with all the lights on and my eye caught the temp gauge well into the red

try the earths on the back of the gauges and clocks..

cheers, will have a look tomorrow

yep what the dwarf said

or voltage regulator?

I had a similar problem last year and after checking all the existing earths cured it by running a new earth (25sq mm) from the main earth point on the chassis to an earth point on the bulkhead and from there a smaller earth to the back of the clocks.
Initially I had thought I had an overheating problem but after a while I noticed how it manifested itself whenever the heater was used.
The fact that cleaning the earth points didn't cure it leads me to suspect a dodgy cable hence why I replaced it completely.