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Old 06-07-2005, 12:09 AM   #1
bboy
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Member#: 56468
Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
Dirty White

Default Need 12V+ switched power in engine bay, ideas?

I'm trying to wire in water injection and the Aquamist pump calls for a ignition switched power for the pump and rest of the electronics. Is there some place under the hood I can tap into. Any chance I can tap into the "Front Accessory Power Supply Socket" inside the engine bay. I tried tapping the yellow/red wire coming out of the fuse box, but it's not switched on with the ignition.

I also looked at the window washer, but it's switched in the passenger compartment.

Almost everything I can think of in the engine bay is run off of a relay.

Knowledge or suggestions are welcome.
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Old 06-07-2005, 04:11 AM   #2
Uncle Scotty
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I'd mount all the control electronics in the cabin and wire it through the firewall, if possible.....might end up being easier that way......and there HAS to be a IGN hot circuit in the engine bay fusebox.
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Old 06-07-2005, 07:05 PM   #3
bboy
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i can take everthing into the passenger compartment if need be. I'm using the stock air intake as a mounting platform for the pump, pressure valve, fuses, relay, I just thought keeping it all in one place made sense. I can run the wires if I need to.

Thanks for the reply.
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Old 06-07-2005, 09:29 PM   #4
2phless
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I'd guess that most anything running ignition under the hood shouldn't be sharing it's current supply with another load. Tapping wires and THEN finding out they are, or are not the one you wanted is a realy bad practice. There is a nice, heavy gauge ign source behind the knee bolster at the ignition harness. The knee bolster removal is 2 metal screws and 1 plastic one. The firewall has rubber gromets in it, one easy one is behind the TMIC. (uh... which impreza are we currently referring to anyway?)

If you think the water injection requires a lot of current then use 10 or 12 awg wire, fused at the battery, to a relay (mounted in the car or under the hood) that is controlled by an ignition source (or an aftermarket switch if you don't need to run it all the time). Just make sure if anything grounds out, a fuse will pop close to the source you tapped it at. Otherwise wires can get hot in a hurry and do very bad things.

If 12 volts is not your ball of wax, seek hands on assistance. I'm always happy to help make sure a subaru upgrade is done right (locally, sorry)... and even if I charge, I don't charge much. Always waaaay less than the cost of burnt up replacement parts.
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