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Old 05-11-2013, 01:36 AM   #1
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Electrical (stupid question)

As I have recently have finished most of the roof repairs and other structural stuff My ? is the wiring to the 12 V system Black&white to the Batt I feel should be Blk Hot + batt and white Neutral - Batt
Reason is the ? is that heat nor the the fridge will fire Im thinking the polarity may wrong as I have read both units are Reverse polarity protected The furnace doesn't even try the thermostat checked good @ 7+ amps the blower would dim the lights the fridge pilot should at least have a pilot light (bulb) lit ??? I would try the 110 V but none available.
Help please
Tks. Ed
I forgot the owners Father in law lived in it until he got his own place as stated every thing was in working order
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Old 05-11-2013, 02:20 AM   #2
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Most 12v electrical wiring i have played with (lots) the black is always neg. Usually the pos is red but rvs i have found use white, red, brown, grey, I gues watever color they had.
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Old 05-11-2013, 03:20 AM   #3
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Use a meter to check polarity

Wire colors / function, in my motor home, depend on what system. Chassis wiring seems to follow automotive color code with black being ground, and colors positive function. Working in the coach I find the black is now 12v positive. Everything I have worked on inside the coach seems to be wired like house wiring. Black 'hot' white neutral. I now use a polarity protected DVM to determine positive / negative polarity working on anything on the motor home. I do not trust wire color to tell me anything. I use my meter every time since I wired a led light fixture backward, thinking black was ground. I messed with that thing way too long before I got my meter out and checked polarity.
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Old 05-11-2013, 06:38 AM   #4
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In a camper, usually the ground wire will go to the frame close to the battery box on the tongue. Probably black. Should be easy enough to just follow it.
Good luck
Tom
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Old 05-11-2013, 08:03 AM   #5
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just check the polarity with a meter of in doubt.
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Old 05-11-2013, 08:54 AM   #6
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I think I would open the back of the refrigerator and look at the electrical schematic diagram and see what color is on the terminal.
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Old 05-11-2013, 02:16 PM   #7
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If you have black and white, white is -, black is +.
Red and black is; black is -, red is +.
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