Here's another way to see if the wire hooked to pos or neg battery terminal- IF you have an electrical tester- specifically an ohm meter( and you should if you're going to rv-) even a dummy like me can use one... an ohm check from the wire to ground will read very little resistance, commonly called continuity, if the wire hooks up to the battery ground. However, there will be high resistance if the wire goes to the hot side, or B+ side of the battery. Here's the reason- a load on the wire causes high resistance, while a ground wire doesn't , unless it's corroded.
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Don & Brooksy
2009 Crossroads Cruiser, CF32BLT
2018 Ford F350 4x4 diesel,Curt Q20K slider.
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