88R91RD Posted September 14, 2014 Share Posted September 14, 2014 Have a 91 RD that none of the gauge/dash lights are working. Low air light and buzzer works as well as the overheat/shutdown light above the water temp, but thats it. Any ideas where to look/start? Quote Link to comment Share on other sites More sharing options...
j_martell Posted September 15, 2014 Share Posted September 15, 2014 Fuses and grounds all check out? Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
41chevy Posted September 15, 2014 Share Posted September 15, 2014 Fuses , grounds and as dumb as it sounds the gauge light dimmer. I some how dimmed the gauge lights with out realizing it and went nuts looking for the cause. Paul Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
turckster Posted September 18, 2014 Share Posted September 18, 2014 Fuses , grounds and as dumb as it sounds the gauge light dimmer. I some how dimmed the gauge lights with out realizing it and went nuts looking for the cause. Paul Don't feel bad, at least you found the problem without spending money. A customer had a wrecker deliver his truck to us because he could not start the engine. Ended up it was missing a fuse. A driver in another truck jumped into this one to pull a fuse because his radio didn't work. $450 to find out it was missing a fuse. Ouch! 1 Quote Link to comment Share on other sites More sharing options...
88R91RD Posted September 20, 2014 Author Share Posted September 20, 2014 Haven't found the problem yet. Grounds are all there, bulbs are good, played with dimmer nothing happened. Checked in the "glovebox", all the relays are good. Am I missing something? Another place for fuses? 1 Quote Link to comment Share on other sites More sharing options...
hatcity Posted September 20, 2014 Share Posted September 20, 2014 remove the "glove box" cover. reach in behind the gauges and see if you can wiggle some wires and get them to work. My truck had that problem EVERY morning for a little whilealso, do any of your marker lites work? Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
88R91RD Posted September 20, 2014 Author Share Posted September 20, 2014 Yes all other lights work Quote Link to comment Share on other sites More sharing options...
turckster Posted September 22, 2014 Share Posted September 22, 2014 Dash light switch? Is there voltage to it? From there it goes to dimmer switch. No voltage to dash switch then your issue is from the switch to the fuse panel. If yes for voltage to and out of switch and no to dimmer the issue is between the two. Not sure how the circuit branches out after the dimmer switch without a diagram. 1 Quote Link to comment Share on other sites More sharing options...
88R91RD Posted October 18, 2014 Author Share Posted October 18, 2014 Found problem. Dash dimmer switch. 1 Quote Link to comment Share on other sites More sharing options...
JonesHauling Posted November 13, 2014 Share Posted November 13, 2014 Having similar problem except marker lights go out as well as tail lights and dash,with the flip of the headlight switch. All lights come on then quickly fizzle out and only headlights remain on. Replaced the headlight switch and problem still arise, in addition the left signal light in dash stays on even though indicator is not in left position. Left headlight is dimmer than the right and bright light light indicator in dash is faintly lit. Please help Quote Link to comment Share on other sites More sharing options...
Popular Post gearhead204 Posted November 13, 2014 Popular Post Share Posted November 13, 2014 jones: check your grounds with one head light being brighter than the other tell me there is a poor ground or badly damaged hot wire. check where the loom hinges with the hood either one could be most likely damaged in that area.open the loom and pull each wire like your trying to pull them in two. if one is bad it will break the insulation and you will have found your problem. 3 Quote Link to comment Share on other sites More sharing options...
JonesHauling Posted November 20, 2014 Share Posted November 20, 2014 Thanks Bulldog, wire sliced n half rite at hinge!! Appreciate that Quote Link to comment Share on other sites More sharing options...
morgan creek Posted October 28, 2019 Share Posted October 28, 2019 my fan motor does NOT work and either does my dash lights. Do you know what it could be? Quote Link to comment Share on other sites More sharing options...
Davidmc Posted August 19, 2021 Share Posted August 19, 2021 I have a 1996 Mack RD600. The other day I would turn the key and have full power, the truck would start and everything on the dash would work. Now all my gauges are frozen, my Jake brake won’t turn on, my ac won’t work and my strobe light switch is on the dash and that won’t work either. All the lights inside and outside do work though. I’ve shut the truck on and off and sometimes everything works. Any ideas? Quote Link to comment Share on other sites More sharing options...
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