Onan Generator Starter Battery - Which one?

wildmanbaker wrote:
Not the wiring plans that Fleetwood will send you, but the build/repair plans that are used to build the MH, and RV techs use for repair. Before just replacing the batteries, use a hygrometer to test the cells. Use a manual charger overnight, and test again after an hour of rest. If the hygrometer and a voltage test are good, a load test can be performed. If the batteries are good or replaced, you really need to find out what the hidden loads are, to prevent draining the batteries.

Batteries are swollen and leaking acid out the top. The engine starting batteries are relatively new. The previous owner (has had coach since 2006) does not know the age of the Trojan T-105 6 volt batteries. I do know they will not hold a charge and will not start the generator unless the coach engine is running. The previous owner kept a trickle charger on the batteries.

I figure when you turn the switch off to the batteries, they should maintain a nominal charge enough to crank the generator within 24 hours. They are not doing that.