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hot coil

W

WFE270NWIA

Member
Got a 300 farmall that the coil gets hot.Never bothered when puttering around the yard, but I started using it on the finish mower this summer and that's when I started having problems. I checked the coil it has 3 ohms so it does have a internal resistor. I replaced the voltage regulator 2 years ado with a 20 dollar All States Ag Parts one, and I noticed the amp gauge showed a higher charge rate after that. Put a volt meter on and it charges right at 15 volts at full throttle. Do you think this could be causing the coil to get hot? It died one time wile idling and started back up after it had cooled down a little. Thanks.
 
Fifteen volts is a little high but not too high.

How hot is the coil getting, burn your fingers hot?

That's getting too hot. Possibly it is failing, even if not too old, aftermarket parts are a gamble across the board.

Also points set too close will overheat the coil.
 
Yes 15 Volts is high if it stays there for a long time. A coil can normally be warm BUT NOT so hot you cant hold your hand on it. The location and air flow can affect coil temp such as don't mount it near the exhaust manifold and those metal mounts can help dissipate some of the heat !!! If its actually ?? 3 ohms that should suffice HOWEVER many cheap meters aren't very accurate on the low ohms scales. If it says 12 volts for use with ballast its in reality a 6 volt and would run very hot.

John T
 
(quoted from post at 17:52:36 10/21/21) Got a 300 farmall that the coil gets hot.Never bothered when puttering around the yard, but I started using it on the finish mower this summer and that's when I started having problems. I checked the coil it has 3 ohms so it does have a internal resistor. I replaced the voltage regulator 2 years ado with a 20 dollar All States Ag Parts one, and I noticed the amp gauge showed a higher charge rate after that. Put a volt meter on and it charges right at 15 volts at full throttle. Do you think this could be causing the coil to get hot? It died one time wile idling and started back up after it had cooled down a little. Thanks.
Click to expand...
5 is on high end of acceptable range, but still in. coil will get hot, as that is same amount of heat as a 75 Watt incandescent bulb, plus it is most likely bolted to a hot engine.
 
Perhaps a ballast resister would solve the problem to minimize the current. Ballast resistors help avoid over-current faults in a circuit and maintain a circuits stability by limiting the value of current and voltage.
 
My thoughts exactly,
NO one ever measures amps.
Instead they use the least accurate part of a VOM, ohmmeter.
 
(quoted from post at 17:34:35 10/22/21) I will check that Saturday. Check it with the key on or wile it is running?
Click to expand...
f measuring primary amperage, do it with key on, engine stalled where points are closed. Expect 4 +/- 1/2 amperes.
 
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