Yall making this too hard. Just put a diode in the wire from the back-up lights and one from the switch pointed at the LEDs. You want the end of the diode with the stripe on it next to the LEDs. Diodes should be rated above the current for the LEDs too. Really you could just get by with the one between the backup lights and the LEDs. Now if you had something with higher current or LEDs that drew more than 4 or 5 amps you would need a relay and a diode. If it was an older vehicle I wouldn't worry about feeding back on the back up lights and not using a diode. But back up lights will be on when the switch is on. I bet it wouldn't be an issue on a new vehicle either but I wouldn't chance it. I wouldn't want my backups on when the LEDs were on either.

Last edited by trlrdrdave; 03/08/17 04:58 AM.

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