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Old 05-11-2013, 12:36 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, 01:20 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.

Dave and Laura & two cats
02 Discovery with Accord toad
retired auto rv tech and teacher, wife rt nurse
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Old 05-11-2013, 02:20 AM   #3
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Mid Atlantic Campers
Workhorse Chassis Owner
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Location: Locust Grove, Virginia
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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.
Wayne, Diane, & Bentley (our 22 lb. alarm system)
02 Pace Arrow 37A-Workhorse, 01 Jeep Wrangler toad.
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Old 05-11-2013, 05:38 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
2016 Wildwood 28RLDS
2014 Tundra 1794 Platnum,"23" T-Bucket
2011 Harley Softail, 2010 Spyder RTS
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Old 05-11-2013, 07:03 AM   #5
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just check the polarity with a meter of in doubt.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 05-11-2013, 07:54 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, 01:16 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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