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Check the ground between the battery and the frame/coach. Measure the voltage between the + side of the battery and a ground (not the one on the battery). My experience is that 90% of the time it is a poor ground.
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33' 2008 National Tropical on a Freightliner chassis.We tow a 2001 XJ (Cherokee) RVM#189
Go back and check all of your connections for a missing one.
__________________ Kelly and Jerry Powell with Halo (Lethal White Aussie), Nash the Rat Terrorist, and now Reid, the "Brindle we have no idea puppy"
2020 Grand Design Solitude 390RK-R