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Old 12-17-2006, 07:28 PM   #1
Scooby Specialist
Member#: 127745
Join Date: Oct 2006
Chapter/Region: NWIC
Location: CA
06 WRX 30r 6 speed
99L EJ255 6 Speed

Default IC Sprayer Setup

OK, so please dont tell me to search as I have done so for the last month, and it is only confusing me more. I need some specific answers, and will be greately appreciative.

I am doing a combo install of all the DIY sprayer systems out there. Here is what I have so far:

Scematic #1

Scematic #2

I THINK I have this right, but all the tutorials and DIYs fail to mention all the needed info for my install. Also, it does not work when installed. My main issues is, do I need a ground from the relay? I believe the Red/White wire coming from pin 5 of the OEM IC spray switch is negative, making this a negative switched system.

If this is true, then don't I need to ground this system somewhere, or will the ground on the pump be sufficient? There is no ground present at the moment, except for the one coming off of the pump. This raises 2 other questions:

1. This is a normally closed circuit, so would there be a problem with no ground when the button is not being pressed?

2. Will I drain my battery, even tho I am not using the 87A prong on my relay? I assume no, but I want to make sure.

I am so close to having this work, but it is not quite the same as any other I have seen. This is on a WRX, so it is missing the STI IC Spray timing, pump, and warning light. As far as I can tell the R/W wire is a switched ground, but I am not sure. Thanks for any help.

*edit: I also have this scematic, which is a little different. Could not get it to work either.

So I have reasoned that I only need a ground when the button is pressed, since there should be no signal while the button is unpressed. Once the button is pressed, current is allowed to flow to the relay, and then to the pump. Since the pump is grounded, all is fine.

So 3 questions now: Do the button(s) need a ground?

Does the relay need a ground, or will it also ground through the pump?

What happens to the current when the relay is off? Is there still draw on the battery?

In the original circuit the IC timer has a ground.

In the Stock Circuit + JDM switch it is essentially the same. This is what I am doing, except I dont have the OEM tank, warning light ect. I will probably add a time later on for the momentary IC sprayer switch.

I am gradually gaining some basic electric theory education, but for now I just want to get this working. Thanks
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Last edited by aboothman; 12-19-2006 at 09:21 PM.
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