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Originally Posted by BradZ
Wait, so if i tap it into the REM, and earth it in the boot, it'll be on and off with the amp?
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If the source of the rem power is the head unit, it will switch on and off with the amp (actually the head unit).
BUT, there will be issues with power draw. The power to turn the amp on, is small, its just a relay in the amp to then switch open the fat gauge wiring system. Ive never tried, but I would say it might fry the head unit, or at least keep popping the fuse if you power the light itself off the head unit.
If I was going to use that, I would only do it with a relay. As in feed the relay with 12v (to actually power the lights, that cig lighter socket in the boot sounds good for it, if its fused at the other end), and then plug the relay to trigger from the head unit. Not directly to power the lights. I would just remove the cig lighter fittings from both lights (the light already there, and the new one) and run them off the cig lighter socket already there. Id trigger that relay off the amp like said above.