I’d go Toyota or Lexus… granted Lexus doesn’t have the same “next level” features that they used to but still. Toyota parts.

Big breaker bar, make sure you have the exact socket before trying this.

If a sink leaks water when the nozzle is fully closed, you have a leak. Or in this case, your switch isn’t fully disconnecting.

Or you really screwed up and wired it backwards and have a short.

If the light bar has a cheap piece of frap switch, upgrade to a high quality switch, put that in the circuit, and leave the Crap one to on… that high quality switch is now your on off and if done correctly, won’t drain.

I am a mechanic but this is just information and is in no way a guaranteed solution.

So, if you want to upgrade from cars, you can get a license to work on airplanes in 18months…