I was retaping the main wiring harness on my '70 and I found a snipped-off wire buried inside the tangled mess that I call my wiring harness. It has white inner insulation with the woven fiber outer insulation. It looks just like the hot wire going to my coil and from my TI box, but maybe one gauge size smaller. I cannot find it on any of my wiring diagrams....it goes from the junction box below the steering shaft to where it's snipped off by the wiper motor. I guess it's part of the main harness, but does anyone know WHAT IT IS? Thanks!
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Re: Mystery wire - '70 LT-1
Is this wire connected or disconnected at the engine side firewall junction box? -
Re: Mystery wire - '70 LT-1
It is connected to the firewall junction box, and runs up with all the other wires in the harness and is snipped off right before it would go in front/under the wiper motor. I took a picture, but I have no freaking idea how to put it on here....I thought at first it may be my TCS wire to the sender on the trans, but it runs to the junction box and not the trans.Comment
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Re: Mystery wire - '70 LT-1
i could be wrong but it sounds like the resistance wire use with the non TI ignition that runs to the coil to reduce the voltage from 12 volts.does the power go on and off with the ignition?Comment
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Re: Mystery wire - '70 LT-1
Jeremy, I think the harness you are refering to is the "engine harness" and not the main harness. I'm not sure what would qualify as the "main harness" unless it's that big fat harness than runs behind the dash.
For this vintage Corvette, the ordering of an option like C60 (not on your LT1 of course) may have added another entire harness that duplicated some wires already in the engine harness. I believe blower wiring may be an example when C60 is ordered; the AC harness would duplicate blower control wiring already in the engine harness for the heater blower installation. The AIM then instructed assembly workers to cut the duplicate wire off close to the engine harness..."abandoned in place" so to speak. See AIM note on UPC C60, Sheet E1: "Note: Cut orange wire to within 0.25" of break-out and discard connector."
Judging from the AIM pages for canceled K66 option (UPC K66, Sheet A1), the TI harness, which connects to the ignition switch separately from the engine harness, has a wire with white insulation that runs to the coil positive terminal as you said. Then, according to the ususal AIM procedure for cutting off an unused wire at the harness, the white wire that is cut off close at the engine harness may actually be the unused standard ignition coil wire.Comment
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You guys rock!
I've got the battery disconnected and I never hooked it back up to check if it was hot or not when I turned the key....but I'll bet you guys are right, it's hopefully an unused wire. It looked like it was really snipped clean, not like some meathead took a pair of chompers to it. Also, it had been buried in the engine harness and not moved for a long time....everything on my car either works or I know the problem and just haven't fixed it yet, so that's why I got a little paranoid. Thanks!!Comment
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Re: You guys rock!
Jeremy, you are causing me to learn more than I need to know about TI!
At first, I thought the snipped wire in your engine harness was disconnected at the ignition switch, making it a dead wire. That is not the case. I thought the pink wire shown removed from the ignition switch connector on UPC K66, Sheet A1, was the wire that became the white wire at the coil. Actually, one branch of this pink wire goes to the fuse panel, and the pink wire was only removed to allow a duplex connector to be installed into the ignition switch connector, which permits a wire from the TI harness TO BE SPLICED into the pink wire. The wire from the TI harness routes through the firewall at the same grommet that has the oil pressure gauge line.
There are actually two wires to the positive coil terminal for the standard ignition installation...a white wire and a yellow wire (from the starter solenoid). Close examination of the AIM sheet (K66/A1) shows the yellow wire is separated from the white wire, and the yellow wire is connected into the TI harness. The disposition of the original white wire is not clear, but the engine harness is spelled out as being taped; I believe the tape covers the snipped white wire that is probably still hot when the switch is on.Comment
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