relyt120 Posted July 16, 2013 Share Posted July 16, 2013 so... My mj is my daily driver its a 89 4.0 auto on the column but all of the sudden last week some strange electrical gremlins appeared. Namely the marker lights below the headlights come on with the brakes and one bulb from the passengers marker lights comes on with the left turn signal. Everything that is supposed to light up still does and the rear lights are working correctly. Also the brake switch now makes an audible click when it engages now. It is obvious that there is a short somewhere in my wiring and I am assuming it is under the dash, since I smoke tested a couple wires several months ago , though I was able to repair what I thought was all of the damage at that time. I am seriously considering getting a complete under dash harness from an xj so I can be done with that horrible mistake once and for all. Direct swap? Opinions? thanks for reading Link to comment Share on other sites More sharing options...
1989 Eliminator Posted July 16, 2013 Share Posted July 16, 2013 You could try upgrading your body grounds. If there is a bad ground that could be apart of it. If you want I have a manual at home and I can send you pictures of the wiring diagrams. I can possibly help ya diagnose it! Link to comment Share on other sites More sharing options...
ComancheKid45 Posted July 16, 2013 Share Posted July 16, 2013 Have you replaced any bulbs in the tail lights lately or any other light bulb for that matter? Link to comment Share on other sites More sharing options...
Keyav8r Posted July 16, 2013 Share Posted July 16, 2013 Did Lucas (known in Britain as the House of Darkness) supply lighting and wiring harnesses for MJs? Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 16, 2013 Share Posted July 16, 2013 Did Lucas (known in Britain as the House of Darkness) supply lighting and wiring harnesses for MJs? Fortunately not. I had a lot of Volvos and Saabs in the past - all Lucas House of Darkness junk. Link to comment Share on other sites More sharing options...
relyt120 Posted July 16, 2013 Author Share Posted July 16, 2013 Have you replaced any bulbs in the tail lights lately or any other light bulb for that matter? I did replace a bulb in the taillights recently but i can't remember if this started happening before or after that Did Lucas (known in Britain as the House of Darkness) supply lighting and wiring harnesses for MJs? Fortunately not. I had a lot of Volvos and Saabs in the past - all Lucas House of Darkness junk. I have heard the horror stories let us all be thankful that they did not! You could try upgrading your body grounds. If there is a bad ground that could be apart of it. If you want I have a manual at home and I can send you pictures of the wiring diagrams. I can possibly help ya diagnose it! I will go through the grounds as soon as I can,I have never done it on this truck before :oops: , if that doesn't work wiring diagrams may be exactly what I need to figure this out. Thank you. Link to comment Share on other sites More sharing options...
relyt120 Posted July 16, 2013 Author Share Posted July 16, 2013 Have you replaced any bulbs in the tail lights lately or any other light bulb for that matter? I see where you are going with this..... :doh: Ill check the bulb when i get off work, i hope that is the issue. it makes so much sense! Or so little! Which ever way you slice it.... guess I probably should wonder why I have a random taillight bulb in my glove box. Link to comment Share on other sites More sharing options...
ComancheKid45 Posted July 16, 2013 Share Posted July 16, 2013 chances are you replace a dual filiment bulb with a single.......had the same issue a couple years back. A new 1157 bulb and the problem was gone ;) Link to comment Share on other sites More sharing options...
relyt120 Posted July 16, 2013 Author Share Posted July 16, 2013 Its definitely the bulb, I pulled it out and now its fine. I'll replace it the next time I'm at the parts place. Thanks for that advice. Though one of the right marker lights still comes on with the left signal. Must have a wire crossed in the headlight harness, its a 99 harness wired to a 89 plug. Link to comment Share on other sites More sharing options...
relyt120 Posted July 17, 2013 Author Share Posted July 17, 2013 Looks like I spoke too fast, drove it to work today and the issue still persists. I have not replaced the bulb yet but I pulled the one I thought I replaced. Just to be certain can someone tell me which bulb goes in which socket? According to my owners manual I should use 2057 in the stop/tail lamps, 1156 in the turn signal lamps and also 1156 in the reverse lamps. no mention of 1157 in the manual but I take it that it is a direct replacement for the 2057 bulb. So I guess my question is which bulb goes in the top socket, and which goes in the middle socket? Link to comment Share on other sites More sharing options...
cruiser54 Posted July 18, 2013 Share Posted July 18, 2013 Click on the link in my signature and go to the post about connector refreshing. there's a photo of a connector which could be the source of your problem. Link to comment Share on other sites More sharing options...
relyt120 Posted July 18, 2013 Author Share Posted July 18, 2013 Click on the link in my signature and go to the post about connector refreshing. there's a photo of a connector which could be the source of your problem. I love that whole write up but I have an 89 Mj so no c101 connector, If you mean the ECU connector I'm sure it wouldn't hurt anything for me to refresh tha tconnector so this weekend while I'm messing with it I will do that anyway. Do you know which bulbs go in which sockets in the tail lights? Link to comment Share on other sites More sharing options...
jimoshel Posted July 18, 2013 Share Posted July 18, 2013 Stop, tail 1157 Back up 1156 The top and middle bulbs are 1157 The bottom bulb is a 1156 Link to comment Share on other sites More sharing options...
relyt120 Posted July 18, 2013 Author Share Posted July 18, 2013 Stop, tail 1157 Back up 1156 The top and middle bulbs are 1157 The bottom bulb is a 1156 Thanks Jim Link to comment Share on other sites More sharing options...
cruiser54 Posted July 18, 2013 Share Posted July 18, 2013 Click on the link in my signature and go to the post about connector refreshing. there's a photo of a connector which could be the source of your problem. I love that whole write up but I have an 89 Mj so no c101 connector, If you mean the ECU connector I'm sure it wouldn't hurt anything for me to refresh tha tconnector so this weekend while I'm messing with it I will do that anyway. Do you know which bulbs go in which sockets in the tail lights? Click on the link in my signature and go to the post about connector refreshing. there's a photo of a connector which could be the source of your problem. I love that whole write up but I have an 89 Mj so no c101 connector, If you mean the ECU connector I'm sure it wouldn't hurt anything for me to refresh tha tconnector so this weekend while I'm messing with it I will do that anyway. Do you know which bulbs go in which sockets in the tail lights? The connector I'm referring to is the one for the front lights, the one in the photo. You should do the Ground Refreshing, Connector Refreshing, the ICM to Coil contact refreshing anyways. Link to comment Share on other sites More sharing options...
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