mikekaz1 Posted February 15, 2016 Share Posted February 15, 2016 Curious on why my GEN light has been on.... battery is good. And alternator charges just fine. Voltage is at roughly 14.5 like it should. What controls the light? Link to comment Share on other sites More sharing options...
Eagle Posted February 15, 2016 Share Posted February 15, 2016 What make and model vehicle are we talking about? "GEN" refers to generator, and the MJ doesn't have a generator. Where is this light? Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 1991 mj 4.0ho its on the left with all the other lights, I believe its right ontop of the check engine light Link to comment Share on other sites More sharing options...
Eagle Posted February 15, 2016 Share Posted February 15, 2016 Does your MJ have gauges, or idiot lights? If you have idiot lights, is the ALT light on when this GEN light is on? If you have gauges, what does the voltage meter show when running? I've never heard of a GEN light in an XJ or MJ, and I don't have a '91 vintage FSM to look at the layout of that auxiliary light panel. I'm half tempted to suggest removing the bulb from that space and forgetting about it. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 15, 2016 Share Posted February 15, 2016 I do have the 91 FSM and there is no GEN light on any of the instrument clusters used in the 91's. The indicator above the CHECK ENGINE light is the MAINT REQD light. Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 ...mines shows GEN ill take a pic when I get home. I have full gauges and it stays right at 14V Link to comment Share on other sites More sharing options...
Minuit Posted February 15, 2016 Share Posted February 15, 2016 I swapped an (I believe) 1996 full cluster into my '91 and it has a GEN light. Not sure what it does, but it never comes on. Is your belt tight? Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 15, 2016 Share Posted February 15, 2016 Plenty of threads about it; it looks like a 1996 thing only. It didn't happen in the 91s so you don't have the original cluster obviously. That light slot is wired for the MAINT REQD light in your 91. It's just a timer that comes on at about 85K miles that reminds you that it's time for a new O2 sensor. I'd just pull the bulb. Do a search for Jeep GEN light to see what it means in the 96.......... Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 Is your belt tight? uh... go fish? its tight enough that everything works, but i do have the typical semi-constant belt squeak. my 95% sure my tensioner is stripped as it won't tighten (move) any more but it not maxed out either Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 hmmm guess it must be a replacement cluster then (obviously if 96 was the only year for GEN) my guess now is its just lit GEN thinking its MAINT REQD. other then pulling bulb, is there any way to clear the light? not that pulling is a big deal just curious. makes me wonder how many miles are truely on this truck..... the custer says ~214K Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 so i guess in 1996 with the OBD2 the GEN light just meant there was a issue with the charging system. why they used GEN instead of a battery symbol or ALT, who knows. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 15, 2016 Share Posted February 15, 2016 hmmm guess it must be a replacement cluster then (obviously if 96 was the only year for GEN) my guess now is its just lit GEN thinking its MAINT REQD. other then pulling bulb, is there any way to clear the light? not that pulling is a big deal just curious. makes me wonder how many miles are truely on this truck..... the custer says ~214K The dealer can clear that nag light - no other way that I know of. I pulled the bulb on mine...... Link to comment Share on other sites More sharing options...
mikekaz1 Posted February 15, 2016 Author Share Posted February 15, 2016 Ah. OK. Good to know thanks guys! Its COOOOOOLD up here. So I'll leave it still (been there months anyways). But I have a cluster bulb that's loose and flickering. So when I fix that I'll pull the bulb for the GEN Link to comment Share on other sites More sharing options...
Minuit Posted February 15, 2016 Share Posted February 15, 2016 Yeah, pull the bulb. Might just be the '91 electronics lighting up what it thinks is the MAINT REQD light. :dunno: I highly doubt the '91 has the functionality for the GEN light unless it's internal to the cluster. Link to comment Share on other sites More sharing options...
gogmorgo Posted February 16, 2016 Share Posted February 16, 2016 I may have pulled my maint req bulb and forgotten (and/or it could have burned out) but I'm not sure. After having it sit for over a year with a dead battery, and then swapping the motor, new exhaust and o2 sensor, it's no longer illuminating. I'll be putting a bulb into the full-time 4x4 spot cause I swapped in a 242. I'll check when I pull the cluster. Maybe this weekend? Link to comment Share on other sites More sharing options...
Rockfrog Posted February 16, 2016 Share Posted February 16, 2016 Unplug the timer, and the light goes out. Smoky plastic jobs under the dash. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 16, 2016 Share Posted February 16, 2016 Unplug the timer, and the light goes out. Smoky plastic jobs under the dash. Only for Renix. The timer for the HOs is in the ECU.......... Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 16, 2016 Share Posted February 16, 2016 Yeah, pull the bulb. Might just be the '91 electronics lighting up what it thinks is the MAINT REQD light. Exactly. Link to comment Share on other sites More sharing options...
Rockfrog Posted February 16, 2016 Share Posted February 16, 2016 Unplug the timer, and the light goes out. Smoky plastic jobs under the dash. Only for Renix. The timer for the HOs is in the ECU.......... IIRC that didn't start until 93 or so ... Something to check, I've parted a 91 XJ with the timer and used to own a 92 YJ that still used one, but then that's YJ stuff. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 16, 2016 Share Posted February 16, 2016 Nope, the emissions timer isn't even listed in the 91 and up parts manuals. . Maybe the Canadian export models junked them later - I don't know........... http://www.factorychryslerparts.com/products/RELAY--TIMER--Emission-Maintenance--TIMER--Emissions/4390292/56002460.html Link to comment Share on other sites More sharing options...
gogmorgo Posted February 16, 2016 Share Posted February 16, 2016 My January 22nd '91 built Canadian-spec MJ doesn't have the timer... Link to comment Share on other sites More sharing options...
Minuit Posted February 16, 2016 Share Posted February 16, 2016 My April 17th '91 is timerless as well. Link to comment Share on other sites More sharing options...
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