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Farmall H coil

Chaz We're not sure if the coil is bad or not. Is there any way to test it? We're also not sure if maybe it's damaged, since it was converted to a 12v system, but the coil is still a 6v.

We haven't had any spark when we turn the tractor over. Also, the wire that went into the coil to the distributor, on the coil end, is covered in black oil from the coil. Any help would be appreciated.

jim Oil leak is sign of overheating of coil,but doesn't necessarily mean it will not work. Test coil primary with ohm meter, should read about 1.5 ohms for 6 volt coil, and secondary about 5K to 7K ohms. If original 6 volt coil you need a ballast resistor to reduce current flow through coil so it will not over heat and also burn points. You can also test coil by , with all wires hooked up, points open, pull coil wire out of dist cap, hold near good ground, and make and break contact at the terminal that goes to points with screw driver to ground, evey time you break contact a good coil will emit a nice healthy spark. Make sure , of course you have current available to the coil from switch, test lamp works great. With points closed you should light lamp on switch side and not light lamp on points side, with points open you should light lamp on both sides.
John M Change the coil to a 12 volt coil. jim is right in that the old one may can still be used, but if its leaked any, and you dont have a resistor inline, it aint going to lat long anyways. That oil is in there for a reason.
Chaz M Hey, thanks for the help guys. We checked the coil and found it still works (for now), and we're looking into a 12v coil then.


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