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Resistor wire 3020 recap

F

fixerupper

Well-known Member
A few days ago I made a post about the coil getting hot on a 3020 gas. The 6v coil was getting 13 v or whatever the system voltage was. The owner called me to tell me he got the problem solved. He called a Deere man who knows his stuff and presented his problem. The Deere man said the resistor wire to the coil is supposed to have about 2.2 ohms resistance. The owner dug around in the cut off wires under the dash and found the resistor wire, it measured 2.6 ohms on his meter. The previous owner had cut the resistor wire and bypassed it with a straight wire for some unknown reason. He hooked the resistor wire back up to the coil and now the tractor purrs and the coil doesn’t get hot. So he’s a happy camper tonight and rightfully so.
 
THANKS for posting back! SO many folks receive free help here and can't even acknowledge it.
 
CONRATULATIONS and thanks for the feedback. Looks like, as suspected, you need to add series resistance (be it a resistive wire link or a resistor) when using a 6 volt coil on a 12 volt tractor WELL DUH lol

John T
 
(quoted from post at 08:13:50 07/06/18) I'm amazed his coil is still good as many times when that happens they are done for.
Click to expand...

When I was in farm mechanics school 50 years ago a couple of my classmates were trying without success to get an engine out of a 6volt tractor started using 12 volts. When it came break time they left for the break room with the ignition still on, throwing 12 volts into the 6 volt coil and a charger on the batteries. After break, when they hit the starter there was a Big Bang and a big blue cloud went up to the ceiling. The whole shop was suddenly so quiet you could hear a pin drop. The top had blown off the coil and the guts were sticking part way out. It was a tar filled coil so no oil went flying. It made a perfect display of what is inside a coil.
 
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