Wiring a relay for parking light flash on remote starter. Parking light system draws more than the output of the on board relay so programmed the output jumper to (-)200ma output (factory is positive). Question is this, I will need supply 2 12V inputs to the relay, so can they just be drawn from the same 12 supply wire from the batt? Also, parking lights draw 15 amps, so how much should I fuse the supply wire at if its operating the relay coil as well?
Sounds like the output jumper can switch the relay coil on the low (ground) side, so you can run the same 12 volt wire to power both the coil and the lights. If the jumper can only supply current and not sink current (though it sounds like it can sink current and you are all set), you will need a separate signal line connecting the jumper through the relay coil to ground. For a 15 amp lights plus the relay coil, a 20 amp fuse is the next larger automotive fuse and will protect the circuit without nuisance blowing. Just make sure the supply wire to the relay and lights is at least 16 gauge or it might get too hot.
