If you have a 12 volt test light you could attach it to the wire and to a known ground, if it lights it's hot (12 volt positive) If it don't light it'd be ground no?
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Bob & Sandi, dogs Tasha a Frenchie and Tiki a Skipperkey
SW OREGON 2005 34 foot DolphinLX
If towing: a bright red 2016 Mini Cooper on a tow dolly.
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