My 5 year old Trojans look like they're on their last legs. 11.9volts this morning! I fired up the genny and the battery charger "Charge failure" light lit up and it took 4 minutes before it kicked in. It went into bulk charge (surprise, surprise!) at 80amps, but within 30 minutes, had dropped down to 12.7amps. But when I'm running the engine, the Leece Neville alternator is constantly banging in over 100amps.
I thought the batteries determined how much charge they want, so how come the battery charger is dropping down so quickly?