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Old 04-18-2015, 10:17 AM   #1
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Class C Battery Terminals

2013 Class C - Thor Chateau


Which MH cable is connected to the HOUSE battery POS and NEG battery terminals?

Will the 12V lights work if the POS / NEG terminal connections are reversed?
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Old 04-18-2015, 10:42 AM   #2
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The coach batteries will probably not be directly connected to the chassis batteries, by a heavy cable . They will be attached to the chassis charging system, through relays or an isolator to prevent the coach from draining the chassis ( engine start ) battery while your living in the coach.
Reversing the connections on the coach battery , then connecting to shore power or starting the engine , can result in damage to the convertor/charger, alternator on the engine ( if not properly fused ) and any circuit boards in the coach,( fridge, furnace , air conditioner) so getting the connection right the first time is important.
I take it from your question the coach battery cables are off and not clearly marked. You will need a multi meter to test before you attach any wiring.
Test the connections , with the meter set to the ohms scale, with the meter grounded to the vehicle frame , the ground wire will show zero , ohms.
The battery power wiring should show an open circuit. Then with the cables still disconnected from the coach battery , and the multi meter set to DC volts, start the engine , the wiring that showed open circuit , should now show charging system voltage, 13.2>14.2 volts.
With the engine off, plug the coach into shore power , the same wire you found charging system power from the engine will have voltage from the convertor charger.
You can operate 12volt lighting, in the coach with the cables reversed , BUT any other 12 volt system in the coach can be damaged by reversed polarity.
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Old 04-19-2015, 07:14 AM   #3
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Class C Battery Terminals

Thanks for the reply. Just to clarify, when testing the cables for continuity, does it matter if the battery disconnect switch is in the connect or disconnect position?

The cables were removed for battery charging and replaced based on an earlier photograph. However, the battery connection to POS and NEG does not seem correct.

The cable from the chassis (possibly the isolator) is connected to the POS battery terminal.
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Old 04-19-2015, 07:28 AM   #4
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Quote:
Originally Posted by mik2 View Post
Thanks for the reply. Just to clarify, when testing the cables for continuity, does it matter if the battery disconnect switch is in the connect or disconnect position?

The cables were removed for battery charging and replaced based on an earlier photograph. However, the battery connection to POS and NEG does not seem correct.

The cable from the chassis (possibly the isolator) is connected to the POS battery terminal.

Regardless of which position the disconnect switch is in, you should have continuity between NEG and the frame of the motorhome. Between the POS and the frame should be an open circuit.
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