Instrument lights

[kevtherev]

Hello Gonzo and welcome

sounds to me like there's a dead short try tracing the cabling as far as you can
or run a wire from the batt to the lights bypassing the dimmer and check them too.

[Mocki]

the problem is often the heater illumination bulb holder with these symptoms, check it out, the wires get snagged by the sliders and short out......