k0ua
Epic Contributor
Here is how to start: Get friend with voltmeter. Keep friend, don't let him/her wander away. Place voltmeter directly on battery posts. Turn on lights of the tractor. How much did the voltage drop from the ideal 12.6 volts with the tractors lights on?. Have friend attempt to start tractor. You your self need to set the brake, and make sure the tractor is out of gear. After all you are going to be standing right in front of it so the chance of getting run over is good. So what happened to the voltage right on the battery posts? Did it drop a bunch? Stay near 12.6? If voltage dropped a bunch, say below 10 volts, I would suspect a defective (high internal resistance battery) Work outward now to the battery terminals themselves. Repeat the tests. What happened this time? Work outward to the ends of the battery positive cable usually terminated on the starter large main lug. What happens now when you measure it against the frame ground. Remember each time the assistant is attempting to put a load on the battery by starting the tractor. Report back and we will go from there...