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Old 08-23-2019, 01:16 AM   #1
Junior Member
Brand: Thor Motor Coach
State: Florida
Posts: 21
THOR #14426
Mystery of the Extra Yellow Wire

I have a 25v class C Chateau. It appears that since delivery the alternator has not been charging the house batteries. This caused them to fail and have to be replaced (dead cell). Here is the question. When I replaced the batteries I found a yellow wire (low voltage) that was in the battery box but never attached to any terminal. When I look at the trombetta, I see a yellow wire attached to the right low voltage terminal. Could this be the reason the power is not being routed to the house batteries? There are no other yellow wires in the battery box.

The house batteries charge fine with shore power or generator. The engine alternator is putting our 14.2 volts so there is power available. Also I do not hear a click when I switch the batteries off with the use/store switch.

Any feedback would be appreciated. Trouble shooting tips?

Thank you

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Old 08-23-2019, 01:27 AM   #2
Senior Member
gmc's Avatar
Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
Posts: 1,871
THOR #2829
Certainly sound like it... if you can test for continuity from both ends of that wire, should tell you if it is the same.
If the trombetta isnít seeing voltage from the house batteries, it will think they are dead, and not connect the batteries together to charge from the alternator... that is done to protect the chassis battery in event something is wrong on coach side.

I suspect what really killed your batteries was them not being disconnected from coach when you press store. They will only last a few days with the normal idle draw of the coach. Whether that is the same reason or another problem, Iím not sure.

Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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Old 08-23-2019, 01:41 AM   #3
Junior Member
Brand: Thor Motor Coach
State: Florida
Posts: 21
THOR #14426
Assuming is it is same yellow wire, any idea where it would connect in the battery box?
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