Warm resistor wire
Senior User
Joined: Aug 2003
Posts: 231
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From: Gaffney, SC
It's normal, but what ignition components are you using - original coil and points, or something newer. Newer coils and electronic ignitions should not be used with the resistor wire. They need a full 12 volts.
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Tuned
Joined: Aug 2008
Posts: 413
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Using all original components. Coil, distributor, points, alt, and solid state volt reg.
Thread Starter
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Tuned
Joined: Aug 2008
Posts: 413
Likes: 2
The old coil has been repainted many times over, so there is nothing to be read from it. Seeing the voltage drops from 12 to 6 vlts, when coil is connected, it must have an internal resistor. ???
Senior User
Joined: Aug 2003
Posts: 231
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From: Gaffney, SC
Well no, not really. The voltage drop should be on the lead wire itself, not on the coil, though the coil does draw voltage when the points are closed. Try opening the points and see if the voltage goes up a bit. Anyway, the pink wire should feel warm, but not hot. If it feels real hot, the coil might be bad. Look carefully at the old coil. It should not be misshapen or have any irregular dents or bulges in it.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1960/73 all cars/trucks: COLF12250A .. Resistor Wire-Ignition Coil (Motorcraft DY37).
61.49" long // 1.30/1.40 ohms resistance // Color code Pink // #20 gauge wire.
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1974/87 all cars/trucks w/ DURASPARK: D7AZ12250A .. Resistor Wire-Ignition Coil (Motorcraft DY213).
49" long // 1.30/1.40 ohms resistance // Color coded red with green stripes // #16 gauge wire.
61.49" long // 1.30/1.40 ohms resistance // Color code Pink // #20 gauge wire.
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Originally Posted by orange '63
Newer coils and electronic ignitions should not be used with the resistor wire.
1974/87 all cars/trucks w/ DURASPARK: D7AZ12250A .. Resistor Wire-Ignition Coil (Motorcraft DY213).
49" long // 1.30/1.40 ohms resistance // Color coded red with green stripes // #16 gauge wire.
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Senior User
Joined: Aug 2003
Posts: 231
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From: Gaffney, SC
NumberDummy wrote "1974/87 all cars/trucks w/ DURASPARK: D7AZ12250A .. Resistor Wire-Ignition Coil (Motorcraft DY213 )"
I didn't know that. II've got a pertronix kit in my truck and it called for eliminating the resistor wire. Runs much better.
I didn't know that. II've got a pertronix kit in my truck and it called for eliminating the resistor wire. Runs much better.
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Elder User
Joined: Nov 2005
Posts: 998
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From: Benton, AR
Hmmm interesting. I will be running a different engine in my 66. I bought a Mallory HEI unit with distributor and coil both together. Better do some checking before I hook it up so I don't start my truck on fire.
