Thor Forums

[Thehobe1]

Check to make sure the batteries can supply a load directly from their terminals. Batteries are strange beasts and can look fairly normal until they are actually loaded. A voltmeter only reads the open circuit voltage under no load. I had to replace my "brand new" batteries the first week I owned and drove the vehicle because the dealership let the batteries go uncharged for all of the time the vehicle was on the "showroom" floor. They attempted to re-charge them upon delivery but to no avail. They, of course measure correctly after charging but one was leaking badly and neither held much charge. A 5-10 Amp load using an automotive headlight or other load will tell you in a couple of minutes the condition of the battery. Then, you can find the open relay somewhere in the coach.