87MJproject Posted May 31, 2015 Share Posted May 31, 2015 My 87 MJ project is almost ready for inspection but my reverse lights are not working. I have tried many things for it to work including changing the bulbs, checked the wire for damages, and checked connections from the switch and at the sockets. I am lost. If someone could point me in a direction that would help I would really appreciate it. Link to comment Share on other sites More sharing options...
yxmj Posted May 31, 2015 Share Posted May 31, 2015 You do not say what kind of tranny you have but with any,,,,,,did you check the switch on the trans? Link to comment Share on other sites More sharing options...
87MJproject Posted May 31, 2015 Author Share Posted May 31, 2015 You do not say what kind of tranny you have but with any,,,,,,did you check the switch on the trans? sorry I'm pretty sure I have a BA10/5 transmission and yeah I have continuity through the switch on the trans. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted May 31, 2015 Share Posted May 31, 2015 Be sure the flat 4 connector is secure and clean. Have you taken out the sensor/switch and pressed the ball manually to see if the lights come on. AFAIK the switch is not adjustable like the NSS on an automatic trans, so it either works or doesn't. The best option is to replace the switch. Don't remember how much they cost, but on a BA/10 I believe they are not expensive (at least not as spendy as an AX15 switch). I know I have a working BA/10 switch that I put on my BA/10 a month before I swapped the trans for an AW4. It's basically new. If I can find it and you need it I'll mail it to you. PM me and I'll look for it, Otherwise check your local NAPA for the part. Link to comment Share on other sites More sharing options...
87MJproject Posted June 1, 2015 Author Share Posted June 1, 2015 Be sure the flat 4 connector is secure and clean. Have you taken out the sensor/switch and pressed the ball manually to see if the lights come on. AFAIK the switch is not adjustable like the NSS on an automatic trans, so it either works or doesn't. The best option is to replace the switch. Don't remember how much they cost, but on a BA/10 I believe they are not expensive (at least not as spendy as an AX15 switch). I know I have a working BA/10 switch that I put on my BA/10 a month before I swapped the trans for an AW4. It's basically new. If I can find it and you need it I'll mail it to you. PM me and I'll look for it, Otherwise check your local NAPA for the part. thanks man. I appreciate the help. ill check in to the switch more. Link to comment Share on other sites More sharing options...
ADAs89 Posted June 2, 2015 Share Posted June 2, 2015 Don't forget to check the "trans" fuse under the dash. power to the switch come from there. i'd start from either the battery end or the light end and work the opposite direction checking voltages. Link to comment Share on other sites More sharing options...
Pete M Posted June 2, 2015 Share Posted June 2, 2015 there is a connector in the harness right behind the drivers side rear tire. corrosion inside that one can cause all sorts of rear light issues. :( Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 2, 2015 Share Posted June 2, 2015 Don't forget to check the "trans" fuse under the dash. power to the switch come from there. i'd start from either the battery end or the light end and work the opposite direction checking voltages. I forgot about that one. You can have power to/through the switch, and if that 7.5A fuse is gone, there will be no power to the light Link to comment Share on other sites More sharing options...
ADAs89 Posted June 3, 2015 Share Posted June 3, 2015 Don't forget to check the "trans" fuse under the dash. power to the switch come from there. i'd start from either the battery end or the light end and work the opposite direction checking voltages. I forgot about that one. You can have power to/through the switch, and if that 7.5A fuse is gone, there will be no power to the light If the fuse is gone or blown there won't be power to the switch. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 3, 2015 Share Posted June 3, 2015 sorry I'm pretty sure I have a BA10/5 transmission and yeah I have continuity through the switch on the trans. I thought he said he HAD power to the switch...I re-read that. Continuity doesn't mean power, I got it now. Link to comment Share on other sites More sharing options...
j_gevans Posted March 9, 2020 Share Posted March 9, 2020 On 6/1/2015 at 9:15 PM, ADAs89 said: Don't forget to check the "trans" fuse under the dash. power to the switch come from there. i'd start from either the battery end or the light end and work the opposite direction checking voltages. I've been having issues with my back-up lights for weeks on the Comanche I'm restoring and this was the issue. Wish I had known this weeks ago. Link to comment Share on other sites More sharing options...
NickyV Posted October 15, 2023 Share Posted October 15, 2023 Just dropping by to say that I had the same issue recently, and it was the "trans" fuse. Now... as to why that fuse keeps blowing? Only the fickle Jeep gods and their gremlin minions know why. Link to comment Share on other sites More sharing options...
Pete M Posted October 15, 2023 Share Posted October 15, 2023 3 hours ago, NickyV said: Just dropping by to say that I had the same issue recently, and it was the "trans" fuse. Now... as to why that fuse keeps blowing? Only the fickle Jeep gods and their gremlin minions know why. yeah, the wiring harnesses frequently have... issues. Link to comment Share on other sites More sharing options...
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