back up lights, isolating dual switches

Currently the only upfitter switches being used would be one fused at 30a and it's running the lights now as the power source and switch. Then one of the 15a for my back up camera. I will also be using another one later this week to trigger the relay for my train horns air compressor since it currently is running full time not just on acc power (which i could just grab a non switched acc wire also). 

I was planning on knocking it down to one of the 15a switches since it would only be a trigger for the buck up lights relay in the new wiring set up not the acutal power source. My actual power source for the relay will be direct from the hot side of the battery. Only 1 set of driving lights will be used for this application (at this time may add a second set in the future).

ok...with info and your pic, everything is good.  banded end of diodes together and connected to your aux reverse lamp relay coil.  non-banded end to source.  could also use just one diode on the reverse (BLACK/ pink wire), banded end still to the aux rev relay.  the relays in the upfitter system will prevent any feedback to the lights on the switches.  the diode prevents the upfitter switch from turning on the reverse lamps and associated circuits. thought you may have been adding many lights...gotta quit posting too early.

mark

think of a diode as a one way valve...lets current flow only one direction

Okay I got that part that it only allows flow in one direction but I don't know where i got the theory they also reduced the power like if it's a 15 amp circut it would reduce it down to 1 amp or something similar in conjunction with only allowing flow in one direction...

Got everything installed yesterday with just one diode and it works like a champ thanks for the help...

The only issue I may have would be heat from the diode? I used heatshrink butt connecters to put the Diode inline and shield it. I cut down the diode and slid it inside the heat shink part of the connecter and shrunk then slid another connector from the opposing side over what i had already shrunk and shrunk it as well this incased the diode with two layers of the shrink. It's well shielded but with my lack of knowledge about these I am not sure how hot they get if it could melt the connector and heatshrink.

Next I think I am going to look into wiring up the reverse lights and aux lights to the timed output from the OEM Keyless entry on the Dome Light Circut.