If you have the rig inside a building with it also plugged in, why did you remove the batteries when you have an excellent multistage battery maintainer in the built-in converter unit? Does the converter “hiss” when the batteries are in place and connected? Not sure why or what is causing this, but the converter should have batteries in the system for everything to function properly.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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