How does a G16A shut off?

Petey

I know there have been several threads that revolve around a gas cart not shutting off, but either I am not understanding it or my cart (bought used), has some different wiring. Can someone please explain how a 1998 Yamaha G16A engine is supposed to shut off? Mine has not shut off normally for quite a while, but if idled, it would eventually stall. Now that I just tuned it up, it does not stall and just keeps running. I have to pull the plug wire for it to shut down. The gas pedal switch (if it has anything to do with shutting off) shows that there is continuity when the gas pedal is pushed, and none when it is up. Thanks.

BGW

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Petey

Instead of asking how it is supposed to shut off, which would be nice, all I really need is how I can shut it off (other than pulling the plug wire). Can I ground something out with a switch without doing damage? Anyone?

nobuckbuild

ok well first thing we need to check is the wires to the switch under the pedal back under the frame you need to chase that harness back under cart it goes to the shifter and and over to the starter generator , somewhere along that harness there is a short causing the over run , in fact if you start at the starter by unplugging it and operate the keyswitch and gas pedal that should give you an idea of what is going on with your meter , its a 2 wire white connector on top of the starter, somewhere there you have a splice that someone put in to make it idle .

with that you also need to check power to the small posts on the solenoid under the black cover behind the battery , when all of the key and foot switches are working correctly those small posts should only have 12v when both are activated , check for a jumper wire under there also

sho305

There are two ignitions on most all carts and lawn engines, either a magneto this will have a coil on the flywheel the plug wire comes from. This takes no power it makes its own, every push mower and most under 20hp use this except old kohlers with points and coil maybe few others. The other style is a powered ignition with a ignitor, CDI, points, etc that is powered. This will have a coil not on the flywheel with wires to a control box or points that is powered to run. It must have power to run and stops when you cut the power. The magneto type is the opposite it uses no power but must be grounded to stop it, they usually have a small wire out of the flywheel mounted coil you ground with a kill switch or key switch to make them stop running. If this wire is not grounded to the block it will stay running. I'd guess this does not work and the idle is very low on the carb so it stops running eventually. It is possible a powered ignition is getting power but way less likely, also with yamaha the power goes to the key then pedal then engine, so if you turn the key off or the pedal off it will kill powered ignitions. Yamaha used both types on their carts. You can look up what you have on tntgolf site and see the coil and usually tell if it is on the flywheel or has a control box that runs the ignition.

ez-ha

If it is the same as my 2000 g16 engine it appears to have a "lawnmower type" magneto ignition system. The coil is mounted to the block by the flywheel and has two wires from it..one is a ground bolted to the block..the other goes into the harness and I ASSUME it grounds it out to shut it down.

sho305

That should be how it works, I don't know what/where it grounds. My G9 is 12v ignition and I had to use a relay to kill the clone.

ez-ha

Checked the wiring diagrams link from this site that are correct for G16a and it seems to confirm that the engine stop relay grounds out the magneto when the pedal switch is activated. looks like you could work around the problem by wiring a switch into the blue wire from the ignition plug on the right side of the engine. Maybe your stop relay is bad or the wiring is damaged somewhere if you would prefer to fix it correctly. I would give a better answer if I could but my engine is out and on the bench right now so I can't test out the proper function of the wiring for.

Petey

Thanks to all for the feedback. I had to take off for a couple days after I made the post and that is why I didn't answer. I will be able to get on it this evening to try to figure out what is going on. I will post my progress and I can see already that I will have more questions. Wife is missing her cart because she doesn't want to do the "pull the plug wire" solution. She told me that if I go hunting again before fixing her cart I would be in big trouble. No LOL.

Petey

For a temporary fix, I was going to put a switch that would ground the blue wire that comes out of the engine (in the front) that goes to the gas pedal switch.(As, I believe ez-ha suggested) Then something happened that I did not expect. I unplugged the first connector for the blue wire and the black wire and tried to start it to see what would happen. It started and ran just like normal, and also would not shut off. Then while it was running, I grounded the blue wire and it did nothing. Still wouldn't shut off. I stopped there for now to check with you all to see if that was what it should have happened. I was surprised! Any comments?

ez-ha

Maybe the blue wire is disconnected at the coil? It has a female spade connector on the other end that you cannot access with the black plastic shroud in place, if that has fallen off there isn't going to be any way to shut it down other than the method you have been using. You may have found the actual root cause of the problem all along.