Transmission trigger wire - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 5 Old 03-24-2014, 02:54 PM Thread Starter
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Transmission trigger wire

I'm trying to find a wire that is hot only when the JK is in Drive. I have flashing headlights (along with other lights) for my volunteer fire department. I wan to make it so that when powered, my headlight flasher only comes on when the JK is in drive. That way I can throw it in park, and the headlight flasher cuts off.

Any ideas?

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2008 JKU. 2.5" lift, 35" tires. Lots of dents, redneck pin stripes and kool aid stains in the back seat.

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post #2 of 5 Old 03-24-2014, 06:14 PM
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im not sure but would the neutral safety switch be a possibility?
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post #3 of 5 Old 03-24-2014, 06:45 PM
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It would probably be easier to find a wire that is no longer hot in park or neutral, or goes open... I'd have to think on just where to look for that. I'd want to think somewhere in the system to find that though, it'd take some probing with a voltmeter to see what's available...certainly not a common circuit.

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post #4 of 5 Old 03-24-2014, 07:51 PM
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Do a google search for limit switch. Find one with an arm and roller on it.
Mount it in the console so as the shift lever passes by the roller it closes the normally open switch only when the lever is in the Drive position.

Or, with a normally closed switch, mount it so the lever opens it when you shove it into Park.

Something like this would work:


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Last edited by ronjenx; 03-24-2014 at 08:16 PM.
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post #5 of 5 Old 03-25-2014, 04:55 PM
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How about using a signal from the e-brake to trigger a normally closed relay?

This seems easiest since there isn't a "hot in drive" wire available.

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