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Motor is overcharging batteries

dcmeigs

New member
I have an old sailor 280 12 hp

I have an old sailor 280 12 hp chrysler outboard with charger and a charging circuit. It charges well and the rectifier checks out OK. Problem is that it wants to overcharge the batteries. I can not find any regulator in the circuit. Is there one? Is the charging system unregulated?
 
With a digital VOM diode mode

With a digital VOM diode mode on the ohms scale. I have solved the problem by using a Colman electric cooler (peltier type) that draws slightly more currant than the engine produces. it typically keeps the voltage below 14.
 
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