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All you need is a cheap inductive meter you can pick up at any automotive store. Just hold it against the cable and hit the starter. They are marked with a good and bad range.
Steve
Last edited by RV_Tech; Jun 11, 2012 at 11:45 AM.
Reason: added link
mine does this too. it sits too much and i have to fight to get it started with the batteries being dead. new batteries would solve my problem but... i have sears die-hard golds and they've lasted 7 years... make sure you have good connections at the battery posts, as this can be the difference between firing right off or not even cranking. seems like these trucks dont like to sit for more than about a week. or in my case a couple of days.
I am a bit surprised that no one has mentioned checking to see if the charging system (alternator) is functioning properly. Even a brand new battery is useless if it isn't getting a proper charge.
Putting a 6 amp charger on the truck for 2 hours is not enough to give the batteries a proper charge. IMHO, a small battery charger like that should be left on the truck at least 12 hours.