I was adding a storage compartment light in my 2018 Prism 2200. I removed the water pump 10 amp fuse to splice into the feed wires for the silly white light/switch in the water panel. I was checking to see that there was no power and found about 9 VDC still in the circuit.
I wanted to work on a dead circuit so I disconnected shore power and turned off the battery switch. took a voltage reading and found .5 VDC on the circuit and all the other DC outlets.
I can't figure out why the 9 VDC stray voltage on a circuit powered from one source. Im totally confused by the .5 VDC when the whole system should be shut down. Any advice would be appreciated.
I would say as a first thought, a capacitor in something on that line, but would not expect a water pump to have a capacitor. Next I would think there is perhaps a screw crossing 2 circuits or rodent damage to wiring.
Do you have a tone tracker?
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