need help with wiring
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This is a discussion on need help with wiring within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; Ok, so I installed a simple intercooler sprayer in my car. I wanted a very simple sleeper setup so i ...

  1. #1
    Registered User Aerophyre's Avatar
    Join Date
    Jul 2003
    Tempe, AZ

    Question need help with wiring

    Ok, so I installed a simple intercooler sprayer in my car. I wanted a very simple sleeper setup so i bought a cheap and simple rocker switch from walmart. Its the kind with three blades and an LED that is SUPPOSED to turn on when I turn the switch on. The problem is........ ITS NOT! I've tried everything to try to make it work but I can't. I have it wired like this: The positive lead to the pump is connected directly to the positive battery terminal. The negative wire runs from the pump into the cabin, where I have it connected to the switch. It then runs from the switch to a ground point in the cabin. The switch itself has three blades. If I connect the incoming wire to the 2 blade and the outgoing ground to the 1 blade, the light comes on when I flip the switch but the sprayer doesnt turn on. When I connect the incoming to 2 and the ground to 3, the spray comes on but it wont light. If I ground 1 AND 3, it will spray but not light. I have also tried tapping the hot wire from the boost gauge and hooking it to the switch and nothing happened. Can ANYONE help me with this? Thanks.

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  3. #2
    tan is offline
    Thinking Man's Engine tan's Avatar
    Join Date
    Dec 2001
    Wharton, NJ
    Have you tried a generic automotive relay?

    See pic below
    It's a good idea to put a fuse in between pin 30 and the + lead of the battery. A 20A fuse should be sufficient.

    for the's a diagram from Radio Shack
    Last edited by tan; 07-31-2004 at 10:33 PM.

  4. #3
    Registered User Racenut's Avatar
    Join Date
    Dec 2002
    Switches with lights are usually designed to switch the HOT lead of the device. Hot wire in, hot wire out, the third lead to ground just so the light will work. Especially if it's LED as they have a + and - side. Did the switch not come with a schematic?

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