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2 switch setup for bed rack lights

Fcmalie

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Ripon, California
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2018 JLU, 2021 Mojave
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Trying to figure out how to wire up the bed rack auxiliary lights. I am putting a battery setup under the rear seat for my fridge, and want to run the rack lights off of it as well. I have a VOSwitch JL400 to control lighting from the drivers seat, but I want to add a switch at the bed to run the lights while the truck is off.

If I run the JL400 wire and the bed switch as a trigger for a relay will I need to wire in diodes to keep from power back feeding from either source? As far as I can tell I will need to, but want to be sure.
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