Interior light problem

I cannot get the interior light to work when the doors open
If I put the switch in that position it is always on

I have disabled all switches individually and this makes no difference

Any ideas on next port of call ?

Cheers

You've got problem with a short to earth somewhere. Power is always on to interior light. When door switch is operated ie door opened feed from light unit to door switch is earthed by the switch. Start by disconnecting all wires from light unit to switches then connect one at a time to find faulty one

Have you checked the earth connection on the roof?

Will check earth connection in the morning

Any clues where to find it ? Am a novice so be kind

Black wires are always earth