Roggesound Posted June 25, 2013 Share Posted June 25, 2013 So I'm trying to get my 88 4.0 2wd shortbed to pass NYS inspection. After replacing four brake lines, three brake hoses and two brake cables, plus two new tires and refreshing the ground to the horn, I have come to the point where I'm trying to get my reverse lights to work. No voltage at the lamp socket, no voltage at the fuse box. The fuse is good, and I see a bit of voltage happening when I turn on the turn signals. I know about the switch on the transmission, but I was hoping that the lack of voltage at the fuse box might point to something else. Is there a switch in the steering column? Anyway, I'll probably be under the truck looking at the switch for a bit. Pain in the balls. Incidentally, does everyone's speedometer run backwards when in reverse? I just noticed that. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 25, 2013 Share Posted June 25, 2013 Judging by your signature, I assume the Jeep in question is an automatic? If so, your Neutral Safety Switch may be the culprit. Here's a link showing how to address that and fix it. http://www.jeepforum.com/forum/f11/nss-cleaning-no-reverse-lights-engine-not-starting-971621/ Link to comment Share on other sites More sharing options...
Roggesound Posted June 25, 2013 Author Share Posted June 25, 2013 Thanks! It is an automatic, and a step by step is exactly what I needed. Thanks very much, I'll tear into it right now. Link to comment Share on other sites More sharing options...
Roggesound Posted June 25, 2013 Author Share Posted June 25, 2013 Balls... I broke it pulling it out. $218 on RockAuto... still looking on amazon. That was surely the problem, though. The brass bits were really gummed up, and there are grooves in some of them... so it should be replaced anyway... Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 25, 2013 Share Posted June 25, 2013 Go to the local junkyard and pull one! Way cheaper. That's what I did, have one waiting to go in. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted June 25, 2013 Share Posted June 25, 2013 Related, my reverse lights have not worked in a long time for my AX4. Bulbs are good, fuse is good. Any thoughts? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 25, 2013 Share Posted June 25, 2013 Reverse light switch could be unpluged, damaged or malfunctioning. Link to comment Share on other sites More sharing options...
Roggesound Posted June 26, 2013 Author Share Posted June 26, 2013 Well, 200 bucks later... still no reverse lights. I knew there wasn't one at the junkyard, I was there last week. Anyone have a pinout for the neutral safety switch? Also, this thing is supposed to be adjustable, but I can't move it around very much. It seems to be close to the correct adjustment, but the truck won't start in neutral. It never would with the old switch either... Only starts in park. Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 26, 2013 Share Posted June 26, 2013 Well, 200 bucks later... still no reverse lights. I knew there wasn't one at the junkyard, I was there last week. Anyone have a pinout for the neutral safety switch? Also, this thing is supposed to be adjustable, but I can't move it around very much. It seems to be close to the correct adjustment, but the truck won't start in neutral. It never would with the old switch either... Only starts in park. NSS Pinout at the bottom of this link. http://gojeep.willyshotrod.com/HowtoNSSrebuild.htm Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 26, 2013 Share Posted June 26, 2013 Well, 200 bucks later... still no reverse lights. I knew there wasn't one at the junkyard, I was there last week. Anyone have a pinout for the neutral safety switch? Also, this thing is supposed to be adjustable, but I can't move it around very much. It seems to be close to the correct adjustment, but the truck won't start in neutral. It never would with the old switch either... Only starts in park. My '88 XJ won't start in neutral either. Not sure why... I figured I'll leave it be until it prevents me from starting up at all. Link to comment Share on other sites More sharing options...
Roggesound Posted June 26, 2013 Author Share Posted June 26, 2013 So I checked my new switch using the pinout from Hornbrod's link. Turns out that it's correct for park and reverse, and there is no continuity between any pins for any of the other gears. Maybe it's out of adjustment, but I can't really adjust it at all. So that explains why it won't start in neutral... sadly, it doesn't explain why my reverse lights don't work. I followed the wires back to the C101 connector, so I'm cleaning that out now. It was on my list anyway. Link to comment Share on other sites More sharing options...
Roggesound Posted June 26, 2013 Author Share Posted June 26, 2013 Cleaning the C101 didn't fix the reverse lights either. Although i suppose I could clean that thing more... but this should have gotten me somthing. What the hell were they thinking with that connector? It's packed full of crap. Maybe if I have some time later I'll soak that sucker in mineral spirits to get it really clean. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 26, 2013 Share Posted June 26, 2013 Do the reverse lights come on in any other gear? Also, to answer your question about the speedometer going backwards in reverse... yes, all the pre-91's do that since it's a cable driven speedometer. Link to comment Share on other sites More sharing options...
Roggesound Posted June 26, 2013 Author Share Posted June 26, 2013 No, i've never seen them come on in any gear. I should check that again though, as I only looked at one bulb, and it wasn't on the side I can see from the drivers seat.... I'm pretty sure they're just not getting power. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 27, 2013 Share Posted June 27, 2013 Are you absolutely sure that the 7.5 amp TRANS fuse under the dash is good? Look for a bent pin in the NSS connector also? Does the Power/Comfort button work? (it's on the same TRANS fuse under the dash). Link to comment Share on other sites More sharing options...
cruiser54 Posted June 27, 2013 Share Posted June 27, 2013 Are you absolutely sure that the 7.5 amp TRANS fuse under the dash is good? Look for a bent pin in the NSS connector also? Does the Power/Comfort button work? (it's on the same TRANS fuse under the dash). Bingo!!! Link to comment Share on other sites More sharing options...
Roggesound Posted June 28, 2013 Author Share Posted June 28, 2013 Are you absolutely sure that the 7.5 amp TRANS fuse under the dash is good? Look for a bent pin in the NSS connector also? Does the Power/Comfort button work? (it's on the same TRANS fuse under the dash). That's a good tip. I'll check that out when I get the truck back tomorrow. Thanks. Link to comment Share on other sites More sharing options...
Roggesound Posted June 28, 2013 Author Share Posted June 28, 2013 Thanks very much! It was the Trans fuse. How silly of me to think that the fuse that's specifically for the backup lights would be the only one to effect the backup lights. Ahh, good times. Anyway, off to adjust my parking brake and try to squeeze an inspection out of someone before Monday. Link to comment Share on other sites More sharing options...
cruiser54 Posted June 28, 2013 Share Posted June 28, 2013 Thanks very much! It was the Trans fuse. How silly of me to think that the fuse that's specifically for the backup lights would be the only one to effect the backup lights. Ahh, good times. Anyway, off to adjust my parking brake and try to squeeze an inspection out of someone before Monday. The first time I saw that posted years ago, I immediately went out to the garage and pulled the Trans fuse to see if it could be true. LOL. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 28, 2013 Share Posted June 28, 2013 When I had no back-up lights, I looked at that fuse on my 90 XJ...and said "nah, couldn't be that...that's for the TRANSmission". I must have looked at it 3 or 4 times before I took a really good look at it with a flashlight and it had a tiny line acroos the top of it...blown...Doh!! Interesting to think that every time I've gone "Doh" or "@%" I've always learned something I could pass on later. Good to hear you got it fixed. Side note: Since the Power/Comfort switch is on the same circuit as the TRANS fuse, I can tell if the rear lights are out by noticing that the switch is not working either...or vice versa...Just sayin' Link to comment Share on other sites More sharing options...
cruiser54 Posted June 28, 2013 Share Posted June 28, 2013 True on the switch light. I eliminated the switches on all of mine and just jumpered the harness. Put one of those blanks in the dash. Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 28, 2013 Share Posted June 28, 2013 Are you absolutely sure that the 7.5 amp TRANS fuse under the dash is good? Look for a bent pin in the NSS connector also? Does the Power/Comfort button work? (it's on the same TRANS fuse under the dash). In case someone with a 91 (or possibly 92) has a similar backup light problem, this only applies to a Renix systems. There is no under dash Trans fuse for the HOs. The POWER/COMFORT switch is fed by an independent 10A fuse up in the PDC. Pulling this fuse defaults the AW4 to the POWER mode. Link to comment Share on other sites More sharing options...
motorbikejedi Posted June 28, 2013 Share Posted June 28, 2013 I have a 1987 jeep comanche 2.5 with a four speed, there is no trans fuse and I am having trouble finding a wiring diagram to start looking. Should there be a trans fuse I assumed it was an automatic thing, The online chilton manual is not helping very much! Any help appreciated! Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 28, 2013 Share Posted June 28, 2013 This information does not apply to those with a manual transmission. Link to comment Share on other sites More sharing options...
motorbikejedi Posted June 28, 2013 Share Posted June 28, 2013 Does anyone know somewhere to find a lighting wiring diagram for a manual trans? its not in the online manual! Link to comment Share on other sites More sharing options...
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