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Old 04-25-2005, 03:53 AM
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hot Coil

hi Guys What would cause a coil to get hot when i try to start the engine?The car wont start ,turns over slowly. new battary so its getting juice.

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Old 04-25-2005, 03:57 PM
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hot coil

Doc here,

What engine/ignition system are we dealing with here?

Some clues from your post are slow crank, and hot coil...I'd check the solenoid for breaking down, and or a bad ground at the starter.

You should have a wire from the "I" terminal on the solenoid to provide independent power while cranking to the coil...If this is not hooked up, you will lose power in "Start" mode...It won't fire while cranking..

Additionally you should have a resistor at or near the coil..If not, this is one reason the coil is getting hot...The voltage to the resistor on the ignition side should be 12 volts..and 6 to 9 volts at the coil...

If the points have slipped closed this would heat up a coil, and not start also..check those..and while your in there...check to see that the rotor is actually turning when you crank it.

Be sure your battery cables are clean and tight, your ground wire is at or near the starter...and all solenoid connections are tight..

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Old 04-26-2005, 09:32 PM

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Also check the coil matches the dissy as low impedance coils are needed with high energy ignition systems, they can get so hot that they can explode if not matched so be careful for goodness sakes. Older points ignition used higher impedance coils so dont use them on electronic ignition.

Cheers from Australia

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