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Old 03-27-2018, 06:18 PM   #1
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Winnebago Owners Club
Join Date: Mar 2016
Location: CT
Posts: 254
Need help, coach batteries not connecting

I could use some input on this one. My coach batteries aren't charging nor will they run any of the 12V items. When plugged in to shorepower or on generator everything 12V works. Converter is putting out 13.5 roughly but it is not making it to the batteries. And my batteries tested at 12.7 so they should be able to run some LED 12V lights. The disconnect switch seems to be working. The light turns on and off and I can hear the solenoid when I press the buttons. Is it possible the MOBAC has an issue? I'm not sure how to test it. Any help is appreciated.
2010 Winnebago Vista 32K
2019 Jeep Wrangler Sahara toad
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Old 03-27-2018, 08:20 PM   #2
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Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,927
If you take the large wires on the two large terminals on the battery isolation solenoid off and fasten them to one terminal, you'll bypass the solenoid. If you now have 12v power in the RV with the shore cord unplugged, you'll know it's a bad solenoid. If still no power, then look for the large amp fuse or circuit breaker in the cable between the battery and the solenoid. Check for 12v on both sides of that fuse/circuit breaker.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 03-28-2018, 07:00 AM   #3
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Winnebago Owners Club
Join Date: Feb 2014
Posts: 26
Just went through that problem (a couple of times). Here are 2 links that hopefully helps.

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Old 03-28-2018, 03:07 PM   #4
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Winnebago Owners Club
Join Date: Mar 2016
Location: CT
Posts: 254
Problem solved.

I feel a little stupid on this one. This issue was part of a bigger repair when my converter stopped working. Once I had everything installed and tested ok I was putting the panel and other stuff back together and I must have grounded out a wire or something. Everything flickered for a second but seemed to be okay until I found my 12V was out when on batteries only. I found today that I tripped one of the breakers in the front compartment where the MOBAC is located. I was looking in the battery compartment where the diagram says there is a relay or fuse but couldn't find one. Had I looked in this other compartment I would have seen there was another set of breakers and the main panel breaker was tripped. It was too dark outside for me to look further last night so I threw this thread up looking for help. Thanks to those who replied.
2010 Winnebago Vista 32K
2019 Jeep Wrangler Sahara toad
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batteries, need help

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