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Old 08-07-2010, 10:48 PM   #1
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Turn Signal Flasher Problem?

I am new to this forum, but not new to forums. I am on my second Jeep Wrangler 1st was an 04 2nd is an 05 and I have a perplexing problem.
One day last week I noticed that the right side turn signal was blinking fast, and from past experience I thought that there was a bulb that was bad causing the problem. Checked all the bulbs and decided that the rear must be the one. Replaced the rear and this seemed to fix the problem.
Later that night with running lights on it did the same thing on the right only.
When I got home I played with the lights for a few minutes to discover that it only blinks fast when the lights are on and that if you look at the back up light it seems to be getting some voltage when the light flashes also, and if you out the lights on and the right turn signal on along with the trans in reverse the light slows down to a slower than normal speed.
WTF is going on. I have looked at wiring as far as I can and see no possible short so I am wondering if the flasher switch is bad.

I know this is a long first post and I am sorry for that, but this long time mechanic is having some trouble with this one and any help would be appreciated.

Thanks, Steve

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Old 08-07-2010, 10:59 PM   #2
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Same thing just happened to me tonight actually. Except when I open the tailgate with the headlights on the tail lights go off. Also, when the turn signal is on all three brake lights in the rear flash... Not sure whats going on with mine either.

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Old 08-07-2010, 11:05 PM   #3
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Damn Grimlins!!!
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Old 08-08-2010, 07:17 AM   #4
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Bad ground somewhere. I don't envy the hunt.
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Old 08-08-2010, 07:43 AM   #5
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Do you have light guards over the rear lamps. The screws that the tail lights are attached with make the grounds and these guards commonly cause them to have bad connections to the body.
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Old 08-08-2010, 07:46 AM   #6
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Yes, I have guards on the lights.
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Old 08-08-2010, 08:26 AM   #7
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Quote:
Originally Posted by chilisteve View Post
Yes, I have guards on the lights.
Remove them and go back to stock and see if that fixes the problem.
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Old 08-08-2010, 02:05 PM   #8
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Ok, An update on the turn signal problem.......

I didn't totally remove the guards but I did take off the right side taillight and clean the grounding plate at the bolt holes and spray some contact cleaner in the holes on the body.

Put it all back togather and tada!!!!!! I now have an as designed working turnsignal with taillight guards!

Damn amazing what a ground problem will cause in an electrical system.

Thanks for the replies and I hope someone might find my experience helpful in the future.

Steve
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Old 08-08-2010, 05:05 PM   #9
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Quote:
Originally Posted by chilisteve View Post
...Damn amazing what a ground problem will cause in an electrical system...
You have no idea.

Had a Mack Semi at work that when you hit the left turn, the back up alarm would go off. Right turn would flash the clearance lights on the tractor and trailer. 4 ways (hazzards) worked normal. Same as you, bad ground behind the left turn lamp.
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Old 08-08-2010, 06:23 PM   #10
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Check the relay, it may be going bad. When I had the original lights and had the same issue, but when I switched to LED tail lights and got a new flasher relay the problem went away and it's been fine since.
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Old 08-09-2010, 06:24 AM   #11
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My problem was definitely a bad ground. Due to the tail light guards. I tapped the holes used to secure the tail light to fit a larger size screw and it solved the problem.
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Old 08-09-2010, 12:13 PM   #12
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When you encounter aftermarket items that do things like this, no need to drill out larger just remove the paint or coating on the new item around the mounting hole, or even a tooth washer to make good metal to metal connection.
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Old 08-10-2010, 06:33 AM   #13
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In my case it was necessary to drill new holes to achieve a good ground. Was rusted around screw holes, also screws didn't secure the tail light fixture securely.
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Old 08-10-2010, 06:39 AM   #14
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Die-electric Silicone Compound will stop all the rust from forming and will protect all the electrical/ground circuits at the same time.

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