[Willyracer]

I might be misunderstaning but how did you test
With the light. The input is taken to ground.
Or did you mean you tested the switch only . I would make
A long jumper and temp short it to the battery neg post
Once removed the racepak led should start flashing (recording)
If it doesn't start recording I would check the 12v and neg wires
Going into the recorder.
The simple things are always the hardest to find.
Lol