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HOT 6-VOLT IGNITION COIL

J

JKC

Member
Have a 1953 John Deere 60 gas tractor. Recently replaced some distributor parts, new points, plugs, condenser, etc. Tractor has not been running or been started in many weeks, but has been sitting in the shop. Was going to TRY to start it today, but after connecting battery cable and turning switch on, just by accident, I noticed that the 6-volt ignition coil casing was VERY hot to the touch. The tractor had not been cranked or running yet, so cannot blame engine heat. This is obvious electrical in nature, but I don"t really know where to start looking. I guess the question is: What will cause the ignition coil to heat up, just being connected to the power of the battery????

Any help would be very much appreciated! Thank you.
 
You turned the switch on but did not crank it right?? So that means the points where closed and you took you time to try to start it and yes a coil will get hot if you wait say a minute or 2 to spin it over
 
I think you have battery voltage feeding your coil. Use a volt meter or test lite to check for voltage at the coil. Make sure the ignition switch is in the off position. If your switch is off and you have battery voltage at your coil I think battery voltage is some how back feeding your coil. Hal
 
(quoted from post at 16:31:40 05/14/11) Have a 1953 John Deere 60 gas tractor. Recently replaced some distributor parts, new points, plugs, condenser, etc. Tractor has not been running or been started in many weeks, but has been sitting in the shop. Was going to TRY to start it today, but after connecting battery cable and turning switch on, just by accident, I noticed that the 6-volt ignition coil casing was VERY hot to the touch. The tractor had not been cranked or running yet, so cannot blame engine heat. This is obvious electrical in nature, but I don"t really know where to start looking. I guess the question is: What will cause the ignition coil to heat up, just being connected to the power of the battery????

Any help would be very much appreciated! Thank you.
Click to expand...
ou apply power to coil With points closed, there is only the wire resistance inside it to carry current & dissipate heat (about 25 Watts) if stock coil, more if some hot rod coil. Drops to roughly 3 Watts when running. Call it normal & don't have ign on when stalled.......tough on coil & points!
 
They will get hot if the points are closed. An inductor at steady state DC is essentially a short circuit, the current through the coil is limited only by the resistance of the point and coil windings. It's very hard on the points to leave the ignition on with the engine stopped.
 
I believe a 60 is 12 volts. If it has a 6 volt coil there has to be a resistor between the switch and coil. Did it get by-passed when you were working on the dist?
 
Thanks very much to all of you who took the time to respond to my question. Yes, the tractor is a positive ground, 6-volt tractor. Most of you were indeed correct, the points were indeed closed and the switch turned "On" at the time I was finding the coil hot to the touch. Although I thought this was "abnormal", I learned something here, from you all, that it is "normal" under the conditions existing at the time.

Thank you all very much. I appreciate your help!
 
Is the tractor set up with by-pass starting?
Which coil terminal is connected to the distributer?
Why a 6V coil on a 12V tractor?
 
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