Here's a pic of that setup on an H4 mag, your J4 should be similar. You need to disconnect the wire from the mag's coil to the points. The grounding wire needs to be disconnected from the mag too. You will need an ignition switch with battery voltage fed to the switch and from the switch to your auto type coil. Then from the coil to the points. Hal
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Today's Featured Article - Pop's Tractor of Gold - by Gary Teate. My father was a simple man but could repair just about anythin mechanical that was ever made. From the time I was a young boy growing up in Jacksonville, Florida, I would spend a considerable amount of time helping my father repair or rebuild equipment and engines, etc. on our 2 1/2 acre "spread". Pop always dreamed of having more acreage out in the country where he could retire and tinker as much as he wanted and often reminisced about his boyhood days on his grandfathers farm in Montecello,
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