Alternator stops charging after about 15 minutes.

[ddegange]

Hello all. I'm having a charging issue. I have a hunter 410 and after starting the engine, it will charge normal for about 15 minutes and then drop to no charge at all. If I restart the engine it happens all over again. This occurs no matter what the state of charge is in the battery bank. It's a yanmar motor with a Next Step Regulator. The battery bank consists of 3 group 27 batteries of 220 ah each. Not sure whether to be looking at the regulator or the alternator. Thanks.


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[Sardean]

Does your next step regulator have led indicator light as this will flash a sequence to tell you what is happening, check this with the manual and you will probably find a setting may require adjusting or there is a fault ect

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[Cheechako]

Are you sure it drops to no charge? My Next Steps went strong for 15-20 minutes then backed off and tapered down. Maybe something is wrong with your regulator. Also, look to see if the Next Step has a battery temp sensor wired in.... it's possible you have one shorted battery that is overheating...? Just thinkin out loud here...