Andrew Can you determine the amp draw at the clutch (SB 3.2 amps)? The reason I ask, the clutch runs on the fan 1-2 circuit (fuse 10 - a common meltdown fuse), if any of the connections are loose or weak you will get a weak clutch engagement. If the clutch quits at a predictable heat range I would agree with you that it is bad, but based on your comments I am suspecting some other cause. You can jump the clutch wire to the jump start peg to check amps and watch function. If it stops working under heat that way at least you will know for sure. Use a fused jumper. Harold McElraft - 3354