I'm sure it is Surface Charge because after I run the engine, the voltage on the display panel reads 14 volts DC. Then after just a few days the voltage drops into the 11's. At around 11.5 volts, the engine will not start. If I let my RV sit for two weeks or so, do I have to put a external battery charger on or pull the negative terminal? You seem like you know what you are talking about. Wow would I like to talk to you. Mercedes told me to run the engine every week to charge (partly) the batteries because parasitic discharge will drain it. Can I talk to you? Thanks alot Doug
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