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Old 03-30-2010, 12:59 PM
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burning out coils

I have 1984 chevy p/u and have shorted out 2 coils in three wks.
dont know why.

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Old 03-30-2010, 09:04 PM
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You should have a resistor mounted on the firewall or near the coil. It is a ceramic type a couple inches long. These are used to lower the voltage to the coil after startup to about 8 volts which allows the coil to last longer. If for some reason your coil has been jumpered around the resistor, that could be why.
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Old 03-30-2010, 09:28 PM
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Quote:
Originally Posted by S10 Racer
You should have a resistor mounted on the firewall or near the coil. It is a ceramic type a couple inches long. These are used to lower the voltage to the coil after startup to about 8 volts which allows the coil to last longer. If for some reason your coil has been jumpered around the resistor, that could be why.
Not on a stock '84 truck with an HEI, ballast resistor is pre-'75 vehicles with points distributors.

To the OP - is this the stock HEI distributor in this truck??
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Old 03-30-2010, 09:41 PM
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Quote:
Originally Posted by kfence
I have 1984 chevy p/u and have shorted out 2 coils in three wks.
dont know why.
If OEM it should be a large cap w/integrated coil.

Was the module replaced?
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Old 03-31-2010, 04:21 PM
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replaced module
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Old 03-31-2010, 04:23 PM
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replaced module. only resistor inside next to module
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Old 03-31-2010, 04:32 PM
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Quote:
Originally Posted by kfence
replaced module. only resistor inside next to module
That's probably the capacitor for reducing radio interference, shouldn't affect the coil, you can disconnect it to see- possibly a prob. if it was internally shorted to ground, maybe- but doubtful.

Coils aren't known for failing, if there's been any electrical work done under the hood, I'd suggest you go back over everything.
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Old 03-31-2010, 05:20 PM
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Check the engine ground, if it is not clean and tight it can cause more current to be drawn through the coil to compensate for the bad connection.
Also what is the feed voltage at the HEI batt terminal. If it is over 15V you can burn coils.
Are you using quality replacements like an AC Delco or the Autozone house brand.
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Old 03-31-2010, 07:15 PM
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So you are burning out coils instead of the modules?
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Old 03-31-2010, 07:17 PM
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Quote:
Originally Posted by ericnova72
Not on a stock '84 truck with an HEI, ballast resistor is pre-'75 vehicles with points distributors.

To the OP - is this the stock HEI distributor in this truck??
Not saying you are wrong but my 1980 Chev. truck had HEI and a ballast resistor.
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Old 03-31-2010, 08:20 PM
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Was the distributor cap replaced? Make sure the ground wire inside the cap
is good.Sometimes the ground is a stamped peice of metal and can be over looked in the old cap. This will cause burnt out coils.
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Old 03-31-2010, 09:10 PM
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The spring that makes the contact between the coil and the carbon electrode to the rotor and the electrode itself can be burned out and/or damaged. This is located under the distributor cap, where the large rubber washer is located. There should be dielectric grease on the washer side that faces the cap.

The metal strap is used in some HEI's under the coil, others have a wire. This must be in place.
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