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post #1 of 3 Old 08-01-2002, 08:06 AM Thread Starter
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Anybody with electrical experience (Moved from 94/95 Tech)

I am wireing up a on/off switch for my water injection pump. Can I wire the hot side directly to the battery (fused), and run the negative side to the switch in the car? Anything wrong with that?

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Gary


Yellow 95 GT vert, Kenne Bell Blowzilla/Flowzilla, Y303 Heads, Water Injection.
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post #2 of 3 Old 08-01-2002, 10:56 AM
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If I understand you correctly, I'd think you wouldn't want to do this.

The car's electrical system is negative ground, which basically means that you feed the positive lead with voltage (switched or otherwise) and the return path is the ground. From what I understand of your question, you want to connect the negative to the switched (positive) lead, not what I'd recommend.

The simplest solution is to run the positive to the switched circuit and the negative to a nearby ground.

If the current draw of the pump is high, then you'll want to use a relay. The ignition switched circuit will trigger the relay, and you can feed the pump with battery current (with a fuse). This is basically what the starter does, with the starter solenoid being the relay.

Either way, you should put a manual switch between the switched circuit and the relay/pump.

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post #3 of 3 Old 08-02-2002, 02:04 AM
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I agree with INTP. You should use a positive ignition switched source. Your idea sounds like the way interior lights are wired; not good for ANYTHING engine related (except the underhood light

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FMS extender, BBk headers, Bassani X-pipe, Flowmaster catback, FMS C springs, Hurst shifter, KN, CAI, 190 lph, 3.73 gears, 3220 lbs w/o me, 97k miles
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