a couple possibilities. If it runs ok with the jump pack, but not on the battery alone, then I"d start troubleshooting at the battery.
check for poor battery connections. Especially the ground. Check the cable from the battery to the frame. I think it may connect to one of the engine mounting bolts. Maybe its vibrated loose over time.
Or, you have a problem with your battery and/or charging system. OR the magnet in the electric clutch is starting to short. I"ve seen some electric clutches draw enough from a partial short to overwhelm the charging system, but not blow the fuse, and still work. Eventually they burn out and stop working. A good clutch should only pull about 4 to 6 amps when its on.
Battery and charging system both need to be in good shape for the electric PTO clutch to work. Put a voltmeter on your battery posts and see if you have more than 13.5 volts with the engine running, PTO off. If its below 12.5 your battery is weak, and your charging system isn"t working. If its 13.5 or better, then the charging system is working, but the battery may not be good. remove it and have it tested, or if its more than 3 or 4 years old, just replace it, due to heat and vibration, its about all a battery in a garden tractor lasts.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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