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Old 04-02-2019, 10:53 PM   #1
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Phantom DC Voltage

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.
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Old 04-02-2019, 11:13 PM   #2
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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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Old 04-02-2019, 11:32 PM   #3
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WAG the 9V were caused by the effects of inductive coupling between 120V AC wiring and 12V DC wiring running parallel somewhere.
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Old 04-03-2019, 07:00 AM   #4
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No tone tracker. Also RV is a year old with no rodents. But the screw is a possibility.
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Old 04-03-2019, 07:03 AM   #5
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I was thinking inductive coupling. The electrical schematics say to keep 12V and 120 V wiring at least 1/2” apart but I see many instances of both tie wrapped together.
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