It's only when the magnetic switches throw. Once the circuit is open, running the motor with the engine on or off does't effect the light. I could try running a larger wire to the propane solenoid but I'm already at only a 3% drop with whats in there now. Thanks however, as this will give me something to think about and look into.

On a friends boat when ever he used the Pactor Modem his Trident Propane Panel alarm went off.

Ciao