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Even more simple: get a 12V test light. Then get a plug and wire a 3 foot wire to the ground only.
When you need to test for 12V, plug into the nearest receptacle, hook your light to the pig tail and then poke things. Fuses will have an opening at the top so you can test for voltage on both sides. I unplug from shore power.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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