Hello all. I have a 1968 cope that I am installing air conditioning (Vintage Air) into. I am needing to splice the vintage air violet wire into my ignition wire. I need to find the ignition wire that only gets 12v when the ignition is hot. So I should be able to eliminate the brown ACC line, the red BATT line and the dark green GRD line. However, there is a pink IGN line, a black KEY- line, a pink with double black stripe KEY+ line and a purple with double white stripe SOL line.

Can anyone help with this?

Thanks,

Henry

I believe the pink line is your feed to the coil. This would only be hot when the ignition is hot. The pink with double black is neutral safety switch for a starter interrupt.

Is there constant voltage going to the SOL (I assume that is solenoid) line with or without the key?

That pink/yellow lead to the ignition is only at +12 volts when the starter is energized. During the run mode, there is only 9 volts or less on that pair of wires due to the resistance wire in the pink lead.

You can get switched +12 volts from the fuse block under the dash from a terminal near the center of the block labeled "IGN". I would guess the A/C system needs more amperage than the pink/yellow leads could provide, anyhow. Also it needs 12 volts.

If you don't feel like hacking into original wiring harnesses or snaking wires through the firewall you can always use a relay to give full battery voltage and use the original resistance wire for switching the relay.

Hank, do you want to splice into the ignition wire or a wire that is switched 12 volts when the key is on?
As stated above your ignition wire is not 12 volts, unless you've switched to an HEI.
The pink/black is the ignition wire but it has a resistance dropping the voltage to 6-9 volts.
The yellow wire from your starter to the ignition coil is 12 volts but only when the starter is engaged.
There is a dark green idle solenoid wire that is 12 volts with the key on.
There is a black/white idle stop wire that may be hot with the key on.
I don't know if these solenoids are used on your car but the wires and connectors should be there.

Seems like your instructions should tell you where to get your power from. If not, you might want to check their website. It's pretty good.