robbie95 Posted February 2, 2017 Share Posted February 2, 2017 1991 Jeep Comanche 2.5 I4 Base Model I know there is probably 100 other topics like this, but my problem is kind of different and I can't see to find anything that is exactly like mine. So a few months back, a back turn signal light burnt out on me, didn't think anything of it, replaced the bulb, and that's when my problem started occuring. I looked in my owner's manual and found the correct size bulb, but for some reason when I pulled out the old one, it wasn't the size that was recommended in my manual. So I figured, well I'll just put the correct size bulb in there and it should work. Wrong. Since I've put the correct bulb in there, when I hit my turn signals, they either stay on(stay illuminated on the dash), or they turn on my hazards IN THE BACK, but up front my blinker lights are working. If I press my brake when I have my turn signals on, everything comes to a halt. No turn signals, no hazards.. nothing.. I've tried changing bulbs in the back, tried different patterns, but nothing is working. Could a simple light burning out cause my turn signal switch to go bad? Link to comment Share on other sites More sharing options...
Gene Posted February 2, 2017 Share Posted February 2, 2017 Hi Robbie, Can't say I understand this completely, but the first thing to check is the ground connection for the rear bulbs. If the ground is weak, all sorts of unusual symptoms occur. Changing the bulb may have disturbed the ground connection to start all of this. Hope this helps! Gene Link to comment Share on other sites More sharing options...
robbie95 Posted February 2, 2017 Author Share Posted February 2, 2017 Thanks, Gene. That was one of the first things I did, I checked the ground that is behind the back-right tail light and it seems to be fine, I took it off to see if there was any corrosion, none. Bolted it back down and still having issues. Is there any other grounds I should be aware of? Link to comment Share on other sites More sharing options...
Gene Posted February 2, 2017 Share Posted February 2, 2017 So remove the bulb in question, just leave it out, and check 4 ways, brake lights, and turn signals. Do they work normally? Gene Link to comment Share on other sites More sharing options...
robbie95 Posted February 2, 2017 Author Share Posted February 2, 2017 Alright, so I took out the bulb in question, I turn on my left turn signal and it works good, except that my right turn signal faintly blinks (front and back light).. If I turn on my right turn signal, it works perfectly fine.. the left side just stays off. No faint blinking or anything.. Link to comment Share on other sites More sharing options...
Gene Posted February 2, 2017 Share Posted February 2, 2017 Hi Robbie, This really, really sounds like it's a ground issue. Usually when another circuit lights up dimly, it's because the ground of the original circuit is inadequate. I have a link in my signature for a wiring diagram, provided by another member. On page 12 of this is the ground distribution. According to this, there is a separate ground wire from -each left-hand stop/turn lamp -both license lamps -combined right-hand stop/turn lamps -the fuel pump. These all are joined together, and connect to one wire which is the one you checked where it screws into the body. Basically, when there is a bad ground, the current that has gone through the bulb and tries to return to the ground, cannot. So it goes into another ground wire, flows "backward" into that, into the right side bulbs, and eventually completes the circuit this way. I'm not sure just where it is, but there should be a splice point where six ground wires come together, and connect to the one wire, which is connected to the body behind the left tail light. If you are sure that the connection under the screw is clean, and that paint and rust has been scraped off to get a good metal to metal connection, I would try to find that splice point and see whether that may be failing. Good luck! Gene Link to comment Share on other sites More sharing options...
cruiser54 Posted February 3, 2017 Share Posted February 3, 2017 Or dirty socket, or funky harness connector. http://cruiser54.com/?p=35 Link to comment Share on other sites More sharing options...
robbie95 Posted February 3, 2017 Author Share Posted February 3, 2017 So I tried looking for the ground, and I found a disconnected ground (I'm guessing idk), judging from the way the wires run, it grounds both tail lights. The thing is, when I connect it to the ground, it instantly blows the fuse. This is what it looks like. This is the other side. Link to comment Share on other sites More sharing options...
87MJTIM Posted February 3, 2017 Share Posted February 3, 2017 Those wires are the pwr and gnd for the license plate lights. Link to comment Share on other sites More sharing options...
robbie95 Posted February 3, 2017 Author Share Posted February 3, 2017 Those wires are the pwr and gnd for the license plate lights. Thanks, now I can take that out of the equation. lol Link to comment Share on other sites More sharing options...
robbie95 Posted February 3, 2017 Author Share Posted February 3, 2017 Quick question. So I was reading a little bit on the forums, (http://comancheclub.com/topic/41500-mj-light-bulb-list-led-replacements/ this to be exact). My manual told me that the Turn Signal Bulb is a 1156 bulb single filament. So, that's what I purchased.. Am I supposed to have two 2057 bulbs in the back instead of one 1156 (on top for the turn signals) and the 2057 on the bottom? Link to comment Share on other sites More sharing options...
Gene Posted February 3, 2017 Share Posted February 3, 2017 Hi Robbie, I think you nailed it this time! Look in the socket. If there are two brass contacts, they'll just be little round pieces of metal, then that does use a dual filament bulb, which would be 2057. One filament is the taillight filament. The second filament is brake/turn signal. If you put a single filament bulb in, it would only have one electrical contact in the middle of the base. If this shorted between both of the brass contacts, it could cause all sorts of feedback problems. So (by my memory, I don't have my vehicle here) the top two bulbs should be dual filament 2057 bulbs. And, yes, you were right all along, putting the wrong bulb in could have caused all your symptoms. I've never run into this before, but it makes sense! Gene Link to comment Share on other sites More sharing options...
robbie95 Posted February 3, 2017 Author Share Posted February 3, 2017 Gene, I feel like an idiot.. I went up to the auto parts store and bought two 2057 bulbs, put them in and it works fine.. I'll never listen to the manual again.. God, makes you feel like an idiot lol! Whoever wrote this manual needed to be fired, he cost me a lot of time and dignity lmao. Btw, I appreciate all the help, Gene. Link to comment Share on other sites More sharing options...
Gene Posted February 3, 2017 Share Posted February 3, 2017 Hi Robbie, I have never done this, but believe me, I've done more than my share of stupid things. Don't beat up on yourself for this. Learn from it. I guarantee you, you will never make this specific mistake again! And, remember, you were the one that ultimately solved this. Gene Link to comment Share on other sites More sharing options...
1988gecko Posted March 27, 2017 Share Posted March 27, 2017 Mine usually blink quick like a light is burnt out and I can't seem to figure out why Link to comment Share on other sites More sharing options...
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