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Old 05-26-2011, 05:22 PM
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ign fuse box wire???

72 c10 350
I'm awful at electrical FYI... under the dash is a pink wire running into the fuse box. It plugs into a 3A plug and it says IGN next to that but IGN is printed vertically. That wire runs through the firewall then up the passenger side of the motor to nothing.. if I plug it into the battery the truck cannot be shut off by the key. Only by unpluging the wire will the truck shut off. If I ground this same wire the truck won't start and this wire gets very hot.. where is this wire supposed to go?

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Old 05-26-2011, 07:37 PM
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Do not be grounding that wire yo. It is a power feed for something , not sure what, but it ties to the ignition feed wich is why when you hook it up to the battery the truck wont shut off. Grounding it will fry the wiring and the ignition switch etc.
You could use it for the distributor if you change to an HEI. which is what it may actually be for.
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Old 05-26-2011, 08:06 PM
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Yeah haha I knew that part was wrong. But if it goes on the distributer where do I wire it in.. and what's an HEI?
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Old 05-26-2011, 08:07 PM
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Another thing if I don't hook it up to anything the truck runs fine. Could I just get rid of it
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Old 05-26-2011, 08:21 PM
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crc044000,

Hook it to a CB radio or some sort of sound system. It is just an extra wire that is turned on and off by the key.

Scholman
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Old 05-26-2011, 08:26 PM
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Quote:
Originally Posted by crc044000
Yeah haha I knew that part was wrong. But if it goes on the distributer where do I wire it in.. and what's an HEI?
HEI = High Energy Ignition by GM. You most likely have a points type distributor, the wire in question may have been installed to accomodate an HEI with the same wiring harness as they started using them in about 1973.
Leave it alone, dont worry about it.
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Old 05-29-2011, 10:14 AM
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It just powers something under the hood when the ignition switch is on. It may have been the ignition-switched wire for a device that was added on. It could activate a relay, but 3 amps won't power many devices directly. Even something small like an electric choke would draw more than 3 amps.

I would just disconnect and remove it, unless you can find something under the hood that needs a low-amp power source when the ignition is on.

Bruce
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Old 05-29-2011, 10:22 AM
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Quote:
Originally Posted by crc044000
72 c10 350
I'm awful at electrical FYI... under the dash is a pink wire running into the fuse box. It plugs into a 3A plug and it says IGN next to that but IGN is printed vertically. That wire runs through the firewall then up the passenger side of the motor to nothing.. if I plug it into the battery the truck cannot be shut off by the key. Only by unplugging the wire will the truck shut off. If I ground this same wire the truck won't start and this wire gets very hot.. where is this wire supposed to go?
Is the pink wire's connection at the fuse box made w/a female spade terminal pushed onto the fuse box's male terminal? If so, it's an "accessory" or auxiliary circuit that the manufacturers supplied in order for their to be a fused circuit(s) available to add on equipment safely. If it's connected this way, simply remove it entirely, or at least insulate the end of the wire so it cannot short out on anything grounded. In any event I'm surprised when you grounded it that it didn't blow a fuse.


Last edited by cobalt327; 05-29-2011 at 10:29 AM.
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Old 07-23-2011, 01:44 AM
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Yeah this whole thing is very strange. I took your advice and just got rid of it. But basically we r done fixing up the motor and elec we r now moving to the interior. I'll try and get some pics up.
Thanks everyone for your input
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Old 07-23-2011, 07:05 AM
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Prob was for an after market alarm
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Old 07-23-2011, 06:15 PM
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Labled Fuse box >> http://67-72chevytrucks.com/vboard/s...d.php?t=121515
Color Wiring Diagram >> http://67-72chevytrucks.com/vboard/s...d.php?t=185665
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