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Author Topic:   Yamaha Rectifier-Regulator
tjxtreme posted 02-07-2010 04:49 PM ET (US)   Profile for tjxtreme  
I have a 2007 Yamaha 20-HP four-cycle outboard that I'm currently rigging to my 13-footer. The owner's manual cautions against connecting [the motor] to auxiliary circuits unless [the motor] has a rectifier-regulator installed. Until I read this, I had assumed all of these outboards would have this already. How can I tell if mine has a rectifier-regulator?


jimh posted 02-07-2010 11:28 PM ET (US)     Profile for jimh  Send Email to jimh     
Is your Yamaha equipped with electric start?
tjxtreme posted 02-08-2010 10:51 AM ET (US)     Profile for tjxtreme    
Yes, it has electric start.


jimh posted 02-08-2010 11:13 PM ET (US)     Profile for jimh  Send Email to jimh     
If your motor is equipped with an electric starter motor it is designed to have a battery attached. If a motor is designed to have a battery attached, the motor should also have a battery charging circuit. If a motor has a battery charging circuit it will very likely have a rectifier.

Some low-power outboard motors have a battery charging circuit, but the output voltage of the battery charging circuit is not regulated. That's because in small motors the charger circuit output is not able to furnish much current. Instead of regulating the output voltage, the charger just puts out what it can and depends on the battery itself to act as a regulator. The load of the battery is figured to be so great that it can hold the output voltage of the charger to a reasonable level.

There is no way for me to know if your motor has a battery charging circuit, and if the battery charging circuit has a voltage regulator. However, if you have an owner's manual, you should be able to find a listing of specifications for the motor that will describe its battery charging circuit.

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