This is how I bench test a mag. I learned most of it from this site. 1. Get a 3/8 drive socket to fit the nut on the drive end of the mag. 2. Cut a 3/8 drive extension in half. 3. Put the half of the extension with the male end into your electric drill. 4. Put the socket on the end of the extension. 5. Put a spark plug wire into the mag and place the other end close to the frame of the mag. DO NOT hold it in your bare hand!!! 6. Use the drill and socket to rotate the mag the proper direction. 7. A good F-4 mag will produce at least a 3/8 inch spark
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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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