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Old 11-01-2005, 06:16 PM   #1
markadopolus
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Default Help with IC water spray wiring

OK you electrical gurus..... I have a wagon and I am trying to use the 2nd (rear wiper) pump as my IC spray pump. I have the nozzle, and hose set up, I just need to install the wiring and switch.

I have an OEM sti switch that I want to use. Do I need a relay to do this, or can I just use the switch for a ground and hook the pump up to the battery with an inline fuse?

I drew up a couple of diagrams. Please correct me if I am wrong with any of this.

With relay

Without relay
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Last edited by markadopolus; 11-01-2005 at 06:31 PM.
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Old 11-01-2005, 10:11 PM   #2
markadopolus
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anyone?
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Old 11-02-2005, 10:32 AM   #3
Psydotek
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The first diagram looks like your best bet. I don't know what kind of power draw the wiper bottle pump needs, but i'd still use a relay to be safe.

However, i'm not sure what pin does what on the switch. Is the switch a momentary switch? From what i can tell though the line labeled "illumination" is where you're drawing power to activate the relay and the "ground" wire is required because of the bulb in the switch.

[in my opinion, the second diagram just looks wrong unless you're trying to make the grouding wire switched...]
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Old 11-02-2005, 01:28 PM   #4
markadopolus
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Thats what I was thinking. I read somewhere on a thread that if you use an STi switch, pin 1 and 2 are ground, pin 3 goes to the pump and pin 6 illuminates teh switch.
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Old 11-07-2005, 07:30 PM   #5
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OK, so I wired everything up with the relay and it wasn't working. The switch illuminated, I know that the pump is good, but it wasn't working. I then hooked it up like the second diagram (without the relay) and it worked.

Could it be a bad relay? Is it bad that only the switch is grounded?
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Old 11-07-2005, 08:36 PM   #6
Psydotek
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Make sure you have a good ground on the pump. And that the fuse isn't blown already.
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Old 11-07-2005, 08:49 PM   #7
markadopolus
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Quote:
Originally Posted by Psydotek
Make sure you have a good ground on the pump. And that the fuse isn't blown already.
Ground on the pump is good and I checked the fuse twice. I went all obsessive compulsive on the wiring with the heatshrink tubing and whatnot. I am 99.9% positive that all the connections are good.
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Old 11-10-2005, 03:27 PM   #8
StarDogChampion
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i didnt use the relay either. could not get it to work with it, but has been on car for over a year with no problems.
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Old 11-10-2005, 09:39 PM   #9
AndyWRXWG
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why can't you just use it like you are turning on the rear washer? does the switch have some sort of different settings that make it operate differently?
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