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June 2012 Randy’s Electrical Corner

Posted in How To: Electrical on June 1, 2012
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Hey everyone, it’s me, Randy. I’m here today to show you another way to get power into your doors and a different way to turn on your dome light. I don’t know why they call it a dome light, I mean it isn’t dome-shaped, it sure doesn’t light up a dome, so what’s the big idea? I mean, even in old cars when the light was a simple round disc, it really couldn’t be called a dome. A flying saucer, maybe, but a dome? Or even a plate, I mean those old dome lights look more like the bottom of a plate than they do a dome. Last time I looked a dome was supposed to look like a cut-off ball. I don’t know, but enough about domes, let’s get on to the real show.

Meet Jamb Tac, available from Painless Performance Products. It features solid brass connectors capable of moving a whopping 60 amps of current that remains very isolated from the metal of the doorjamb. That means you can pass either negative or positive voltage through them. They’re also available in single-, two-, three-, and five-contact versions. The plastic nuts on the back of the Jamb Tac allow adjustment of the brass for different width doorjambs.

What I am really talking about is a neat way to replace your door switches. When you guys remove the doors from your Jeeps there are a bunch of ways to shut that interior light off. But I’ve figured out a way so that you don’t have to pull the wires, or put a spring on the switches, or remove the glovebox to get to a fuse so you can remove the fuse. Heck, they can even be a good way to replace broken, torn, or otherwise damaged wires and keep them from getting damaged again.

Here is a diagram of what I used each of the brass contacts on the Jamb Tac for. This will work as long as one door is closed. Once both are open, the lights will go out. Sure, I added a couple of relays to pull it off (not shown), but now there is nothing for the Jeep owner to do in order to pull the doors. You notice I don’t use one of the terminals but ground through the door. Some newer Jeeps have plastic sleeves in the door pins and grounding to the door won’t work. In that case, just connect the top pin with the unused one, and ground it inside the Jeep.
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