It all boils down to amps ... its not that great of an idea to let the switch take all the load. Wire up the relays, and let them take the load, then let the switch turn the relay on and off. So, the best way is wire 2 relays, one for forward, and one for backward facing, and then hook them up to the switch how you want them. I wired 2 relays to 2 switches, so I could have them both on at the same time, and not be limited to just forward or rearward facing. J
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