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Discussion Starter #1
hi i recently installed 2 new numax 12v , 170 amps , 1000cca batteries on my boat , when started the volt gauge quite happily sits at 28 volts , what i cant understand is the battery warning light stays on after start up but goes off after about 15 minutes when the engine is under load , the alternator is a self regulated 28v 30a , forgive me but im totally confused any help or advce would be appreciated , thxi
 

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Well micky, the owners of this site will want you to fill out your profile before we start answering questions.

I am curious though, what is the battery warning light warning about?
 

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automotive wiring has to be the most messed up design ever!
You would be further ahead to post on an automotive based forum
 

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Discussion Starter #4
Well micky, the owners of this site will want you to fill out your profile before we start answering questions.

I am curious though, what is the battery warning light warning about?
thanks for reply really not sure, it stays on after the engine is running for around 10 to 15 minutes then goes off once i increase the revs and stays off , just a bit concerned i might be missing something , i dont think its the alternator as the batteries are charging up
 

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Sounds like a one wire Delco 10SI alternator. If so, that’s just the way these alternators roll. They will not charge until you increase the engine revs to about 1/4 throttle then they excite and charge.
 

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28v is to low to charge 24v setup. More rpm allows the alternator to reach 30v where the regulator will kick in and the light turns off
 

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Discussion Starter #7
thanks so much for that i was thinking the alternator was giving up , ok fully understand it now , thanks for youre help , appreciated
 

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Install a smaller pulley on your alternator so it spins at a higher RPM and it will start charging at a lower engine rpm
 

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