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Electrical help needed #1045491 04/22/12 04:14 AM
Joined: Jan 2005
Posts: 1,528
barak Offline OP
Body Damage is Cool
Hi guys , am going to fix my VIS so that the rear lights do not flash anymore with my LED tail lights on. Right now i can start the Jeep and everything is fine , but as soon as I touch my brake pedal or turn on the lights it lights up and flashes until I turn off the jeep.Now I know that it looks for resistance to tell you a bulb is out , so I ordered these, they are 50 watt 6 Ohm resistors.

[Linked Image]

Now , I know how to install them, as per instructions they give you also.

[Linked Image]

My question is with the wiring on the Jeep. It is a 96 grand cherokee ZJ , and I have enclosed the wiring diagram. With the way the LED are hooked up there is a white wire , red wire and a black wire going to the stop lamp / tail light wire.Those are hooked up properly obviously as I have been driving it for 2 years, and it passed a safety inspection where they make sure all your lights work.I can't remember what the plug was like before I cut it off , but I believe it was 3 wires , pink/white , light blue , and black.Black is obviously ground , I believe LB was stop lamp and PK/WHT was for the tail light.Now , down to my question that I need an electrical guru for.With the resistors , do I put one on the LB and one on the PK/WHT and hook them both up to the black ground?Or how do I go about hooking the resistors up.In the wiring diagram (below) it shows the 2 wires going to the plug with the ground.My other thought was would it work with 1 resistor going to both wires plus the ground , or would that cause a short as each wire controls the rear lighting.One obviously lights up the tail lights when the lights are on , the other lights up the LED when you hit the brakes whether the lights are on or not.

[Linked Image]


Here is the link also in case it is too small for anyone to see it

http://i2.photobucket.com/albums/y26/shadowbarak/rearlighting.jpg

Hopefully one of you guys that know electronics can chime in with an answer to this question.It would be nice to have the VIS not keep flashing at me all the time when I know everything is good back there.

Ok , was reading through my wiring diagrams and came up with the following.L22 circuit is the Light Blue wire that powers the tail lights , side markers , and license plate lights. L73 circuit is the Pink / White wire that powers the stop lamp (brake light) , and both wires share a common ground which is Z1. Also looking at the wiring diagram it looks like the bulb had 2 + besides the ground in 1 bulb , which is the wedge style connector instead of the ba15 socket style. Hopefully that will help give a little more information.


1996 Jeep Grand Cherokee 5.2 with mods.Hughes Air gap intake , 52MM TB , ford injectors, 2 3/4" lift, Doug Thorley headers , HID headlights with LED , HID fog lights , glow gauges , a few others
Re: Electrical help needed [Re: barak] #1045492 04/22/12 04:22 PM
Joined: May 2009
Posts: 306
M
MartySoCal Offline
Mudrunner
*****
What I used to do at the dealership when a customer didn't want to spend the $$$ to replace a failed module, was unplug the lamp outage module inside the rear trim panel, (near the left rear tail light IIRC), then plug the harness back together. Doing this eliminates the light out warnings. I think there was an easy access panel there, just reach in and unplug it.

Installing the load resistors will cause the light circuits to draw as much current as the regular bulbs, eliminating one of the benefits of using LED's.

If you want to keep the lamp outage module in place, simply install the load resistors in parallel as seen in the second photo, one at each bulb. I don't see you needing 50 watt resistors on all the bulbs, most draw much less wattage, especially the third brake, license and side marker bulbs. Maybe 5 watts at most. You can google the bulb numbers and find the wattage ratings of each of them. Your local Radio Shack/Electronics parts store probably has them in stock.


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