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Hot resistor

G

Golden Retrievers

New User
1949 8N, 12V, side mount dist.

Resister got so hot it started small fire under hood, melted wires that ran to key assembly. Installed new resistor and key assembly worked fine. There was no build up of mouse nest or leaves etc.

Since then I have monitored the resistor and it gets very hot even when engine is not running but key is turned on. Don't recall this being an issue in the past.

Comments/ suggestions on cause and solution would be very appreciated.
 

sounds like a short to ground in the ignition. disconnect the wire from the resistor to the coil, and then run a known good jumper wire in its place. see if it stops heating up. if it does, u need to replace the wire to the coil.
 
hey Golden........listen to Cookie.......use a real 12-volt round can coil in yer side mount dizzy. NAPA IC14SB. NO EXTERNAL RESISTOR, EVER!!!........Dell, yer self-appointed sparkie-meister
 
You are not supposed to leave the key on without the engine running very long. If the points are in the right position - it is
normal for the resistor to overheat.
 
A 1949 8N did not have a side coil. It had a front coil. Did you convert it to a side coil?

Of course the resistor gets hot when the key is turned on. That's what it is supposed to do. Leave it on too long like that and you will burn up the coil; see tip # 38.

Something shorted to ground and melted the wire. Best check that out w/ an ohm meter before the tractor burns up.
75 Tips
 
When running, the ignition is on (using current) about 50% of the time. Most piston engines stop with the points closed.
This causes the current to flow continuously overheating the resistor, and coil. Just don't turn the switch on when it
is not running. Jim
 
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