So I have a 67 that I recently (well over the last 2 years, don't ask) converted from manual drums to power assisted discs in the front, all new SS brake lines (never get SS if you want my opinion) and all new everything literally, except for the brake pedal and drum backing plates.

So as I guessed might happen, I don't have enough vacuum for the power brakes. I was thinking canister, but at this point I might as well just buy a vacuum pump and finally put this baby to bed. Soooooo, I was looking for a place to hook into an ignition switched 12 v source. As I'm staring at this rusty old fuse box I see the Ign Switched terminal has a line to it. I trace it back to the engine bay and it is just grounded to something.

Is there any reason for an ign switched line to be grounded? Was this something related to a points ignition that got replaced when I switched to a Mallory electronic ignition?

I checked to see if it had any voltage to it, but it didn't and I had to leave for the evening. I'm guessing if it did have voltage at one time it would have immediately shorted and blown the fuse. The car starts and runs fine, this just seemed odd.

Tonight I'll check the fuse, clean the rusty terminals and then see if I get any voltage. I also had turned the car to on, but didn't actually start it.

I would like to hook the vacuum pump up on a circuit with 15 amp fuse, so I would like to avoid the other numerous piggy backs that run the radio and accessory gauge lights and just have it on its own circuit. I'm obviously not very electrically savvy, but assume piggy backs aren't the best option. But then again I'm not opposed to it, since I don't think the stereo and few bulbs for the gauges and tach draw that much current.