wiring spotlights.

[billybunter]

hi people,need help with earth switching.on 09 d40 ....... billybunter..

 

[joshman]

Eom not sure what you're actually asking? You really should only ever switch the positive leg of a circuit.

 

[sparra04]

commodores are also neg switching
its to do with the headlights auto off when you open door
you need to switch your neg supply from headlight harness to spotties with a relay