1973 evinrude 115 overcharging problem

[edgarop]

hey i have a 115 that is charging at 17 volts from mid to high rpms and at idle it charges at 14 volts. whats wrong with the motor? thanks

 

[petryshyn]

Re: 1973 evinrude 115 overcharging problem

Nothing wrong. Thats the nature of a charging system without a regulator. Yours only has a rectifier. Be sure to keep topping the battery up with water, as it will lose its level over time...

 

[seahorse5]

Re: 1973 evinrude 115 overcharging problem

A system like that one depends on the battery as a voltage regulator. The higher capacity the battery, the steadier the voltage stays.

You cannot use a maintenance free or a sealed battery with your unregulated charging system. A group 27 or 31 battery that you can add water to works the best. Another fix is to wire 2 batteries in parallel.

Back in those days, we also turned on the running lights to help dissipate the excess voltage.

 

[edgarop]

Re: 1973 evinrude 115 overcharging problem

is there a way to adapt a voltage regulator? my VHF radio doesnt like the high voltage.

 

[petryshyn]

Re: 1973 evinrude 115 overcharging problem

Yes, you can add a air cooled regulator/rectifier.

Read this topic.... http://forums.iboats.com/showthread.php?t=349685

 

[boobie]

Re: 1973 evinrude 115 overcharging problem

You can also go to any BRP dlr and get a part # 173640 regualtor kit. They came out about the time this mtr was built.