exteamly hot coil???
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exteamly hot coil???
Hey yall i have a 1981 f150 with the 300. I have recently put a new ignitiong control module , a new distibutor plugs and wires and a new coil the truck cranks up and runs great however i have not put the truck on the rd for long amounts of time yet. I noticed that the coil was getting exteamly hot and im not sure why it is is this normal???? if not what is wrong .
Posting Guru
Joined: Jan 2001
Posts: 2,357
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From: S. Mississippi
If the coil is getting burning hot, then there is a problem. They will get warm after awhile, but they shouldn't get so hot that it'll burn you.
Might just be a bad coil. If you are worried about it take it back & grab another.
Might just be a bad coil. If you are worried about it take it back & grab another.
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
For that year truck with a 300 you should have a round coil with a duraspark 2 module on the left fender wheel well.
The coil positive voltage at idle should be less than battey voltage, around 8-10 volts or so, the reading will depend on the type of meter used.
If the voltage is almost the same on the coil + as across the battery you have found the reason why the coil is running hot.
Ford used a "resistor wire" to drop the coil voltage in the "run mode".
Jim
The coil positive voltage at idle should be less than battey voltage, around 8-10 volts or so, the reading will depend on the type of meter used.
If the voltage is almost the same on the coil + as across the battery you have found the reason why the coil is running hot.
Ford used a "resistor wire" to drop the coil voltage in the "run mode".
Jim
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
more info here
https://www.ford-trucks.com/forums/8...-question.html
It might be easier to just add another ballast resistor if you are currently running full voltage to the coil.
Do you have a starter solenoid with 2 large and 2 small connections?
The 2 small connections are marked…
"I" is for the Ignition coil positive
"S" is for the Starter connection
First step is to check current coil voltage at idle.
let me know what you find..... Jim
https://www.ford-trucks.com/forums/8...-question.html
It might be easier to just add another ballast resistor if you are currently running full voltage to the coil.
Do you have a starter solenoid with 2 large and 2 small connections?
The 2 small connections are marked…
"I" is for the Ignition coil positive
"S" is for the Starter connection
First step is to check current coil voltage at idle.
let me know what you find..... Jim
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87fordman
1987 - 1996 F150 & Larger F-Series Trucks
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