Yamaha G2 Battery Over Charging

J

jstjoehere

New Member
I have a Yamaha G2 that is over charging the battery. I just put a new voltage regulator in it. When I check voltage at the regulator it reads 14.25 VDC like it should. Heres what has me confused when I check battery voltage its getting 16 to 18 VDC depending on engine rpm. I was told that the starter had been rebuilt a year or so ago. Come to think about it when I put a set of head lights on it last year they didnt last very long and the bulbs blew. I had put a couple used batteries in it last summer and never thought anything of them going bad but this fall I put a new battery in and it went bad in a short time as well so when I put the 4th battery in recently I found that it was overcharging. When voltage is high at the battery the starter wont crank unless I give it a little spin by hand is this from the high voltage causing polarity problems? I have checked the wiring and nothing looks shorted or grounded. Id like to see a wiring diagram to make sure everything is connected right.
 
J

jstjoehere

New Member
So after finding a wiring diagram I found that the starter was wired incorrectly. The ground wire was on the f2 terminal and the wire from the solenoid was on the a2 terminal so it was keeping the generator excited all the time not allowing the voltage regulator to controll it. Ill correct the wiring tomorrow since its dark cold and getting ready to snow here in west virginia.
 
J

jstjoehere

New Member
I rewired the starter according to wiring diagram and checked voltage well it was still 16 to 17VDC. But at least I could see the voltage fluctuate when it reached its peak like the new voltage regulator was set wrong. I took the regulator apart and looked at it and found its a simple magnetic points type regulator. So like points on your briggs and stratton you can adjust them. By bending the top contact upward you can reduce the voltage and by bending it downward you can increase voltage. I went by the old rule of thumb it takes 14.25 to 14.50 vdc to keep a 12 v system fully charged. put it back together fixed the headlights and its running like a top. We just use it here on the farm for different stuff but its so handy to have around we really missed it when it wasnt running.

3 inch lift. razor tires. and somehow I misplaced that darn governor one day lol.
 
HotRodCarts

HotRodCarts

Cartaholic
There should be a bolt/screw that's used to make adjustments on the arm inside the voltage regulator.

Glad to hear you got it fixed and thanks for the follow up... :cool:
 
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