Eagle Posted September 21, 2017 Share Posted September 21, 2017 13 hours ago, AMC86Kid said: i don't understand what it means i get that Tachometer inoperative means the RPM gauge but what does it mean by AC voltage under OK ?? This thread is about the temperature gauge, because that's what you asked about and that's what we have been discussiing. If you want to diagnose the tachometer, please start a new thread to discuss that. What's the status on the temperature gauge? Do the fuel gauge and the oil pressure gauge function? Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted September 21, 2017 Share Posted September 21, 2017 My apologies I helped the topic to stray. IMO it is either a cluster problem, or a wiring problem for all the gauges. Unless some of them actually work right???I’d put the temp gauge back and test it according to the book, the extreme for both tolerances are easy to test going though the cluster and wiring. Tach might not be a symptom just a faulty ignition coil. But if it’s not apart diagnosing the temp gauge it’s might be better in another thread.I may pull my cluster like this out of storage to look at it.Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
AMC86Kid Posted September 21, 2017 Author Share Posted September 21, 2017 Eagle i have not tested the gas and oil pressure gauge yet just trying to figure out the temp and RPM gauge for now but yes i will post a new thread for the RPM gauge here: https://comancheclub.com/forums/topic/53947-86-28-rpm-gauge/ also no luck on my temp gauge i think i will just use the after market one i got it works fine but i will try to figure out exactly how the wiring goes when i take my dash apart later Link to comment Share on other sites More sharing options...
Eagle Posted September 22, 2017 Share Posted September 22, 2017 On 9/21/2017 at 5:58 PM, AMC86Kid said: i have not tested the gas and oil pressure gauge yet Nobody asked about testing the gas and oil pressure gauges. I asked if they work. The engine must start and run, since your question about the tachometer mentions idle and then increasing the throttle. So when the engine is running, what does the gas gauge read, and what does the oil pressure gauge read? Link to comment Share on other sites More sharing options...
AMC86Kid Posted September 22, 2017 Author Share Posted September 22, 2017 ok the gas is at the middle and the oil dosent move its at the low end Link to comment Share on other sites More sharing options...
Eagle Posted September 22, 2017 Share Posted September 22, 2017 28 minutes ago, AMC86Kid said: ok the gas is at the middle and the oil dosent move its at the low end If I remember correctly, the 84-86 cluster gauges didn't return to zero when the engine is shut off, they stayed where they were. When the ignition was turned on later for a restart, they then moved to display the current reading -- which would be zero for oil pressure and cold (100) for temperature. I don't think you have a gauge problem, I think you have a no power to the cluster problem. Are you getting a reading from the volt meter? Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted September 23, 2017 Share Posted September 23, 2017 Fuel gauge will stay at last reading for sure (spent a lot of time trouble shooting that gauge). Not sure about the others, I thought the tach, possibly voltage reset and the others stayed put. Might have time this weekend to work on the old jeep a little, if I do I’ll check how the gauges work. I agree, I don’t think the cluster is getting power, which would be the fuse box or maybe ignition. Our 90s HO XJ did a weird thing where once or twice it’ll run but none of the accessories turn on. Can’t recall if the gauges worked or not when it did this. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted September 23, 2017 Share Posted September 23, 2017 Confirmed, oil pressure, fuel level and temperature hold last reading before the ignition is off, tachometer and battery voltage go to 0. At the top right hand side of the fuse block in side on the firewall drivers side there’s a 7.5 fuse for the instrument cluster, it is right under neath the hazard relay. I’d test there to see if your getting power. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
johnj92131 Posted September 24, 2017 Share Posted September 24, 2017 My 86 diesel had a cluster problem as part of a no power to anything in the cab. Turned out to be fuses and contacts that were corroded. Replaced all the fuses and cleaned all the terminals fixed a bunch of problems. Our Jeeps are famous for electric issues mostly related to corrosion. Cruiser54 has been telling us for years to clean connections. Clean and replace everything in the fuse panel inside the cab. It might just cure your problem. Link to comment Share on other sites More sharing options...
AMC86Kid Posted September 27, 2017 Author Share Posted September 27, 2017 ok i will check for power because they don't move when you turn the vehicle back on thanks Link to comment Share on other sites More sharing options...
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