Led Fog Light Backfed Power - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 12-01-2015, 01:18 PM Thread Starter
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Led Fog Light Backfed Power

2015 JKUR 3500 miles on it

Over the Thanksgiving holiday I installed a pair of Trucklite LED fogs using wiring pigtails from Drivetrain America. While not the brightest fog out there they match the Trucklite LED headlights installed with PWMs a month ago.

Parked the JK in the garage jumped out and just happened to be in the garage as the door opener light went out along with the JK dome lights. It caught me by surprise but the passenger side fog light was very dimly lit for about 1 minute after the dome light went out.

I have checked everyday for the past week to find the same exact behavior.

Wanting to get thoughts on what might be backfeeding the fog and comments on whether or not I should dig into it..... I hate knowing there are oddities like this but also know CAN is not exactly simple to troubleshoot and resolve.
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post #2 of 4 Old 12-01-2015, 03:19 PM
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The jeep's electrical system has a small amount of power left in it after the jeep is turned off. You can add a diode to take care of this. I've got Rigid Fogs on mine and they flash for about 3 min after I shut the jeep off.

2014 JKU, Tera44, 4.56 gears, ARB lockers, RK 3.5" flex lift, ARB front & rear bumper, dual Viair 400C w/2 gallon tank, Zeon 10S, Nitto Tires, Genesis Dual battery kit, TeraFlex tie rod & flipped drag link, ARB Intensities and TeraFlex dual rate ST sway bar.
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post #3 of 4 Old 12-01-2015, 03:45 PM
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^^^ that makes sense. I noticed that too when I had a set of cheap led bulbs installed in my fogs. I noticed they were just barely on, and went out shortly thereafter. I never worried much about it.

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post #4 of 4 Old 12-01-2015, 05:50 PM Thread Starter
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There is certainly a power bleed, I think what I found most interesting was that only the passenger side fog appears to have enough voltage to illuminate (and by that I mean at no more than 5% of its normal output).

I suppose I'll try to scratch this from memory so as not to think about it every time I am looking for an excuse to be in the garage working on the JK.
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