Issue with g9 starter generator and engine

shaneste1988

I recently purchased a G9 yamaha gas cart, which apparently had an issue with the starter generator. It also had a issue of the forward /reverse switch being reversed so forward was reverse and vice versa. After buying it and charging the battery, the cart started and drove fine apart from the forward reverse switch being around the wrong way . But after lifting the rear end and testing the charging output i found it to be only charging at 8 volts. After checking the wiring diagram for the cart, i noticed the starter generator was in fact incorrectly wired, (supply + to A2, link between f1 and f2 and - to a1 ) instead of ( supply+ to f2, link between a2 and f1 and - to a2). After finding this i thought i had solved my charging issue so i changed to the correct wiring which also corrected the forward/ reverse switch. Only problem is now the starter generator runs correctly but the engine will not start. To check, i swapped the wiring back to how it was and the engine started straight away, changed it back to correct wiring and once again the engine wouldn't start.

I can't figure it out as i can't see any correlation with the starter generator wiring and the engine not starting , any ideas or help would be much appreciated

BGW

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bigstik40

There was a post here a while back where the poster had purchased an aftermarket starter/generator at NAPA. He had a similar problem in that he had to wire the S/G backwards to allow it to work correctly. Check to see if you have an OEM or aftermarket S/G. The engine needs to crank in the proper rotation to start. Good luck - Ray

sho305

The white/red wire lights up the whole thing so unlikely to be an issue there as same power does ignition and starter. The charging is done with the small wires that power up the windings and make it charge, the VR powers the windings when it wants to charge. Above fast idle it should make batt voltage go up from 12.5 at rest roughly to 13+.

shaneste1988

Cheers for this info , it is a aftermarket starter/generator so I'm guessing it does need to be wired in reverse then. I might now check the output of the two wires of the s/g and try to find out why it's nots charging at 14 volts or so . Guessing it might be a bad voltage regulator ??? Or possibly just no charge out of the s/g

Dave in VA

Pull the shifter arm off of the trans and turn it around the other way to take care of the F and R issue...

cgtech

Uhh, not if the 4-cycle engine is spinning backward...