pink coil resistor wire
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Mountain Pass
Joined: Aug 2007
Posts: 187
Likes: 9
From: western ohio
pink coil resistor wire
Hello,
Working on my 63 truck.The pink resistor wire that goes to the coil gets very warm with the key on.On the starter relay is a wire is for the starter switch and the other one is for ignition.I traced it and it ties into the pink coil wire.I unhooked the ignition wire at the starter relay and the pink resistor does not get warm,but when I hook it back up it gets very warm again.I have a 289 motor in the truck.Which way should it be?Other gear heads say to leave it unhooked.Sure would not want a small fire under the dash when I drive it for the first time.In my wiring book some models have one wire to the starter relay and other have two wires to the starter relay.Thank You
Working on my 63 truck.The pink resistor wire that goes to the coil gets very warm with the key on.On the starter relay is a wire is for the starter switch and the other one is for ignition.I traced it and it ties into the pink coil wire.I unhooked the ignition wire at the starter relay and the pink resistor does not get warm,but when I hook it back up it gets very warm again.I have a 289 motor in the truck.Which way should it be?Other gear heads say to leave it unhooked.Sure would not want a small fire under the dash when I drive it for the first time.In my wiring book some models have one wire to the starter relay and other have two wires to the starter relay.Thank You
Senior User
Joined: Nov 2012
Posts: 254
Likes: 1
Hello Greyhound,
I'm sure someone more knowledgeable will soon answer. In my wiring diagram, the pink wire terminates at the firewall main disconnect, not to the coil. There is a specific length it should be to create the correct resistance to protect the coil during running condition. If the length has been modified, that might be a problem.(I think GM used a step down block under the hood and some newer coils have a resistor in them that I understand to eliminate this requirement.)
I understand that if the wire is not used, the coil and points burn up sooner. A meter will tell you if the proper voltage is going to the coil -After Start- during running. If this is correct, and the pink is still hot enough to start a fire, you should consider replacement.
Sorry for the uneducated answer, I have asked questions on electrical here, and many here don't answer since they may not be sure and don't want to make an error.
But, ALWAYS someone will answer -- eventually
Also, if my answer is incorrect or I misunderstand the question, please someone here correct me
Scott
I'm sure someone more knowledgeable will soon answer. In my wiring diagram, the pink wire terminates at the firewall main disconnect, not to the coil. There is a specific length it should be to create the correct resistance to protect the coil during running condition. If the length has been modified, that might be a problem.(I think GM used a step down block under the hood and some newer coils have a resistor in them that I understand to eliminate this requirement.)
I understand that if the wire is not used, the coil and points burn up sooner. A meter will tell you if the proper voltage is going to the coil -After Start- during running. If this is correct, and the pink is still hot enough to start a fire, you should consider replacement.
Sorry for the uneducated answer, I have asked questions on electrical here, and many here don't answer since they may not be sure and don't want to make an error.
But, ALWAYS someone will answer -- eventually
Also, if my answer is incorrect or I misunderstand the question, please someone here correct me
Scott
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 790
From: Simi Valley, CA
C0LF-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-37) / Obsolete ~ available NOS & from auto parts stores.
61.49" long / Color coded pink / 1.30-1.40 ohms resistance / #20 gauge wire.
1960/73 FoMoCo vehicles / 1974/75 FoMoCo vehicles without DuraSpark electronic ignition.
61.49" long / Color coded pink / 1.30-1.40 ohms resistance / #20 gauge wire.
1960/73 FoMoCo vehicles / 1974/75 FoMoCo vehicles without DuraSpark electronic ignition.
New User
Joined: Feb 2016
Posts: 10
Likes: 0
From: Savage, MN
I have a 74 360 in my 66. Did away with the wire and went to a resistor. Been working great for last year. Got the idea from Autowire company. I picked it up at the auto parts store. Grabbed one for a dodge from that year,
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