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post #1 of Old 07-15-2013 Thread Starter
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m25 alternator question

Hi everyone,

Bit by bit I am starting to understand my bigger boat. I have a question about my alternator and how and what they output.

I have a 1986 Catalina 30 TRBS with the m25.

I just put new house batteries in my boat the old ones were in very bad shape. I put in two 232 AH 6 volt on bank 2. On bank one I have a 70hh 12 volt starting battery.I also have a clipper bm-1 battery monitor.

When I installed the 6 volts the battery monitor after doing the load test to calibrate the batteries showed them at 80% and 12.7 volts.(or very close to that) I connected my changer set it to 6 amps and the BM-1 registered the 6 amps change as 6 amps so working thus far.

I then started the motor after disconnecting the charger to se how many amps it would do. the amps wet to about 7 to 9 and the bm-1 told me at that rate it would take 7 hours to get to full charge. Should it not put more in when the battery is at that level? When I switched back to my starting battery it went down to like 2 as it was fully changed so it is seeing resistance.
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