2014 Sahara after market fog light w/relay problems - Jeep Wrangler Forum
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Old 10-19-2013, 08:09 PM   #1
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2014 Sahara after market fog light w/relay problems

Looking for a little help here....

I am installing these in place of my stock fog lights: 3.5" Round Super-LED® - Whelen Engineering Automotive

The version that has a white driving light built in. Have them all wired up with a relay and grounded to the stock fog harness.

I am using this relay: 12VDC/40A SPST Automotive Relay : Automotive Relays | RadioShack.com

The power source is the battery and trigger is the white/yellow wire from the stock fog light harness.

PROBLEM: The relay clicks on and off extremely fast causing the LED driving lights to flicker. The reason for using the relay was to avoid the flicker problem of taking power from the stock harness. I have read in other posts that unless the replacement lights match the computer will go crazy.

The relay has a 1.6watt coil. When the vehicle is OFF the relay operates normally without issue.

I have also found that when the vehicle is on my meter shows 11.2volts coming down the stock fog light power (white/yellow) as opposed to the 12volts present when vehicle is off.

Any thoughts? Does the 2014 computer recognize the lack of draw?

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Old 10-19-2013, 08:25 PM   #2
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Terminals 85 and 86 are the switching circuit of the relay. Power one and ground the other will turn the relay on. These are the two terminals directly across from each other that are parallel to each other. Terminal 30 is the power input, and 87/87a are out to the load. I'd have to check a wiring diagram to see if the light module switches the circuit on the ground side ( often the case) or on the power side, to determine if it's an issue with that.

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Old 10-19-2013, 08:54 PM   #3
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I reversed the ground and trigger wire as suggested. It appears that the rapid on off is a little less frequent but still happening. I specifically notice and issue when I am accelerating or braking. It's as if there is a lack of power coming down the trigger wire to hold the coil causing a cut out of the lights.
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Old 10-19-2013, 11:35 PM   #4
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Chrysler uses Canbus. I am betting you need capacitors in addition to the relay to stop the flickering.
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Old 10-20-2013, 12:53 AM   #5
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In further investigation I found the following. Vehicle off the relay is drawing .13amps when the vehicle is running it is drawing .095. However, when the relay trigger blade is supplied by the battery rather than the fog light wire (white/yellow) it gets a constant .13amps.

So many other people use a simple relay in what I am looking to accomplish. I am beginning to think something is wrong with my CANbus.... vehicle has 3k miles....
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Old 10-20-2013, 06:05 AM   #6
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Don't use the vehicle harness at all. Wire an interior switch to trigger the relay.
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Old 10-20-2013, 09:23 AM   #7
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The emergency light function is wired to a separate switch. The white driving/fog light function I WANT wired to the factory fog switch. At this point I am concerned of a computer malfunction more than how anything is wired.
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Old 10-20-2013, 03:11 PM   #8
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You are going to burn out the relay.
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Old 10-20-2013, 06:44 PM   #9
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I'm not sure I'd even bother with a relay for led lights. They probably draw less than the factory lights. Having said that, after looking at the canbus system, I would definitely wire them up independently of the factory switch. Unless you really know what your doing with canbus.
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Old 10-20-2013, 07:23 PM   #10
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I think these lights draw much more than the little standard bulb that is used for the regular fogs. If not then perhaps the canbus is seeing a lack of draw on the current and is causing issues?

Afmcronnie, you dont say..... perhaps the reason I posted this question was because of my concern regarding the irregular activity on the relay?

The point here is this... I am looking for a solution to USE THE FACTORY FOG SWITCH. If your suggestion is to not use it, while I appreciate the thought you are putting into the issue, your response will not be helpful. Plenty of people use after market lights with a relay triggered by the fog power wire. I wan't to accomplish this as well.

My plan from here - solder back on the factory fog connectors. I have on order a pair of harness conversion plugs which I will then tap into and re-wire the system utilizing the relay (so the original fog harness looks unharmed). If I find no change I will reach out to my dealer and explain the trouble I am having and the irregular amperage activity.

This may take a week or so as I am going away next week but I will certainly post my findings. Thanks for everyones help thus far.
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Old 10-20-2013, 07:37 PM   #11
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The stock bulbs are 24 watt, so they draw about 2 amps each. Look up the specs of your LEDs. You'll be surprised how much light you get with such a small draw. That's the benefit of LEDs.
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Old 10-20-2013, 07:39 PM   #12
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This is really strange. My relay is only drawing .1 amps and yet the factory computer is randomly interrupting power to it! The relay (with motor running) can only seem to pull .095 amps down the fog power wire but from the battery (with motor running) pulls .12 amps........
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Old 10-20-2013, 07:56 PM   #13
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Google the canbus system. It may help explain the problems you are having.

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