Originally Posted by njadventure
There are only 2 batteries installed. Both are 7 year old, group 24 AGM deep cycles. I thought both were fully charged when I tested. I need test again starting at the batteries.
I'm wondering if/ when I replace them, if I should install one cranking and one deep cycle. It seems to be the popular choice.
I'm waiting on a replacement heat exchanger so I can't run the engine. I couldn't find the stamping on the alternator to determine the amps. Does anyone have a easy way after I get the engine running?
One cranking and a deep cycle bank large enough for your needs makes sense. The 6 volt batteries I suggested are the most durable and the best bang for the dollar and 2 in series will give you about 225 AH @ 12 volts.
No manual for the alternator? If you google the numbers stamped of it you should be able to find its output. Failing that a clamp ammeter on the positive output with the engine running and the batteries in need of a charge will give you actual output.