richardschmidt2759
Veteran Member
I have a two year old 4d agm batt. in my mainship 1 , I charged it about 1 mo. ago, boat is in water year round, no water in blige, I went to check it last week, I turned the key on to get a voltage reading. Showed 11 volts, I put it back on charge for 2 more days, with charger on I read almost 15 v. took charger off read 12.70 v at batt. with cables on, ( surface charge) all cables are less than 2 yrs. old, all clean, all heavy & thight. Only thing on batt ,when switch is off,is high & dry bilge pump, pos. side of batt. goes directly to shut off switch.( took pump wire off) .When I put the pos. ca. back on the batt. I get a VERY small spark, I've seen this many times before on other boats.I always attributed this to small diff. in ground potential. To test for voltage leak, I would use a VOM on amps. correct ? in series , pos. side, correct? what scale, what reading? Also, what should I get for an ohm reading across battery cables, with switch off ?should be the same as VOM not connected to anything, correct? Everything looks ok to me, Hope I don't have a bad batt. very heavy & not cheap ! Eng. cranked ok, maybe just bad meter on dash ? Thanks Rich