Well everything seemed to be pointed in the right direction ........but this morning all the time it was running blowing snow the ammeter was in the negative, even before I engaged the PTO and when I shut her off it was dead as a doornail. So I left it and went to my office. This afternoon I took out the battery and it tested 11.49 and I went to put it on the charger and the charger said it was fully charged.
So I put it back on the tractor and it wouldn't start it.
So why does it start like first thing this AM with no hesitation at all, same battery is now fully charged and it won't start. I guess there is an intermittent issue here maybe. I guess I am back to the drawing board on the testing/ Troubleshooting.
It felt good though for about 12 hours thinking it was fixed. Ah the joys of tinkering.
Hi, I took some readings on my 68 Ford 120, 12hp Kohler today as a benchmark for a similar motor to yours. My tractor was spray-painted in the past so i can't see any markings on electical terminals. Will try to describe the terminals based on location. All readings in volts at fast engine idle.
Starter/Generator has 2 terminals.
Terminal towards front of tractor reads 11.14
Terminal towards rear of tractor reads 15.89
Voltage regulator has 3 terminals on left/pto side the way it is mounted, close to the steering shaft.
Top terminal reads 11.09
Middle terminal reads 15.65
Bottom terminal reads 15.65
I was able to hold the black lead on the -battery terminal for all readings, a pretty compact charging system. My battery was charging at 15.65 volts which means the regulator isn't regulating the voltage down as it should. One or more of my regulator readings above should have been closer to 13.6 instead of 15.6 and that 13.6 or so should be going out to the battery. So i have an overcharging issue, the opposite of yours it sounds like.
Anyway now you have a benchmark esp. for the starter/generator to compare to your charging system. Maybe this can help you figure out where the problem is.
As for why your charger says "charged" but your voltmeter is saying 11.49, and then your engine won't start, if you're saying the battery is too weak to turn the engine over, sounds like maybe your charger is wrong. I would try testing other known batteries like in a vehicle with your voltmeter and charger to see if you can figure out which is true. Since your voltmeter/multimeter is new i would be inclined to believe it, esp. since battry chargers don't seem to last long these days but should check other batteries to be sure. good luck