I had this problem on the 6.2 diesel GMC pickup I owned. If the batteries got weak it would weld the solenoid in the engaged position. Easy enough to cure. Wire the main wire going to the starter solenoid through a Ford style solenoid. Then run a jumper from the main wire post on the starter and connect it the G M solenoid small wire post so that when the Ford Style solenoid sends current to the starter it will activate the solenoid on top of the starter and when you let go of the key, the Ford style solenoid stops the current flow to the starter. I burned up a couple of the 40 MT series starters before I hit on this idea. This happened to the wife one day and all she could think to do was open the hood and scream for me..
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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