Thought it would be simple to branch into existing wiring on rear light cluster.
There are 4 wires going into light cluster the green/brown is the live reverse, the test gauge couldn't find a neutral wire so I wired that side to chassis ground.
So, two wires on my roofrack reverse lamp, the positive spliced into the hot wire and the negative directly to a chassis ground.
Any ideas why light won't come on?
It's an led aux. Lamp so shouldn't overload circuit.
Thank you, peter. 2000 Disco

 

Are you sure you have a good ground? You could run a long test wire from the neg post on the battery directly to the LED to see if still doesn't light. This will confirm if your ground is the problem. If it lights then you have a bad ground connection and need to find another.

Are you sure you have the correct positive wire from the LED to the power wire? On my roof rack LED's they only work one way. If I have the wires backwards it won't light.

Take the light off and confirm that it works on the car battery real quick and remember which wires you had on the pos and neg.

 

Yeah it's super easy, I've done it a couple times now without issue. I would use LED to be safe though.