SUV with 4 interior light pods in a row from front to back. All light up with stock interior light switch. All have LED replacements for the old stock bulbs.
I have an auxiliary 12v battery that I want to use to light the two rear light pods with 1 switch at the back of the truck. I still want to be able to light them from the stock switch and main battery also
I know I need a diode to keep the auxillary battery /rear switch from lighting the two front light pods (and possibly damaging the stock switch?).
So, front switch lights everything from main battery. Rear switch lights 2 cargo bay lights from auxiliary battery.
What size diode do I need? Assume the LEDs are the normal replacements you can buy at any auto store. Small pad of multiple LEDs about 4x4 (2 of those) and two spot light LED bulbs. I don't know volts/amps
Do I need another diode on the other side to protect the auxiliary battery / rear switch as well? If so, same size?
SUV =1999 Ford Explorer XLT