Where's the best power source under the hood to run an electric vacuum pump?

 

All the fuse boxes have a LARGE battery cable hooked directly to the battery in the boot.
Pick one nearest the part you want to power.
The power stud on the 'false-bulkhead' is also a good one. It goes directly to the starter/alternator connections on the lower right side of the engine.

 

I was thinking that stud on the false bulkhead but I'm having trouble finding a place to actually mount it. I thought I could put it under the left cover where the brake boost and resevoir are but it's tighter than I thought under there. Would've been protected from heat there too.

 

Idk what I was thinking. I need switched power. And I got it mounted by the brake booster. Had to lose the bracket.

 

You can still use the battery power supply, you just need a relay that is ON with the ignition power.(small power and earth to the relay)

 

You mean a relay of it's own? I'm not good at designing an electrical setup but can follow a schematic and do it. I just ran the ground to a ground point by the fuse boxes and figured I'd splice into a keyed power source no?

 

Splicing into a circuit that has already been designed for a certain load can 'blow-a-fuse' if the current draw is too much.
I have no idea what power requirement the vacuum pump needs but if it is significant, it likely needs it's own fuse? and a sufficient power source.

 

I agree. Except I was going to choose one I don't use. Like cruise control or something.

 

After asking the question of an electrical source in the other thread, I saw this one. So, now I'm subscribed to both to get the outcome.

 

Haha. Fair enough. I ran the ground to the ground point below the smaller of the two engine compartment fuse boxes and the hot to fuse 3 in the same box. It's a 15amp fuse for the intercooler water pump for the supercharger which I don't have. It's the closest source to the location of the pump. Approximately 3 feet. Nice and tidy and the wires not even noticeable. Wire tied to the same feed as it runs thru the same compartment the pump is mounted in.
You could run it off any circuit you wanted to tho as it only has a 1amp draw.