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Old 02-28-2022, 06:17 AM   #1
Junior Member
 
Brand: Thor Motor Coach
State: California
Posts: 2
THOR #26121
Thor Chateau 2020 not charging coach battery from alternator

Hi all,
This is actually my neighbor's RV. Coach lights and accessories work. Shore power and generator charge the battery. Alternator does not. Found the isolation contactor under the hood below the coolant tank on the drivers side. 2 large red wires, one to the main battery and one disappears below the rig, I assume to the coach batteries. Measure the voltage from each terminal to ground, 12v (ish) on one, zero on the other terminal. Start the engine, contractor goes click and now we see 13v (ish) on both terminals. Is there something (fuse, breaker) between that contractor and the coach batteries? If so, where? I looked all over and couldn't find it. I have another friend with a Jayco and has the same problem.

Thanks,
Steve

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Old 02-28-2022, 12:27 PM   #2
CHS
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Brand: Thor Motor Coach
Model: 2019 Chateau 28Z
State: Tennessee
Posts: 487
THOR #22388
I have the 2019 (2018 chassis). Disregard the (Sprinter Chassis) fuse block. Unless they updated the system in the 2 years, all else should be the same.
If you have 12 (ISH) power on one leg, you may have a loose and/or bad wire or connections somewhere.
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Old 02-28-2022, 05:33 PM   #3
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Brand: Thor Motor Coach
State: California
Posts: 2
THOR #26121
Thanks for the schematic. It looks close to what we saw yesterday. I saw the 70 amp breaker. I'm surprised that there would be no fuse / breaker between the 2 sets of batteries. If this is the case, it's just a wire between the contactor and the coach battery. Everything I can see is tight. I didn't look for a crimp on the insulation. That would surprise me but...

thanks again,
Steve
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Old 02-28-2022, 05:41 PM   #4
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Brand: Thor Motor Coach
Model: Four Winds
State: California
Posts: 406
THOR #24260
Try this schematic.
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