Phillip Gwin Posted June 17, 2019 Share Posted June 17, 2019 Tach doesn't do anything, gas gauge pegs out, temperature gauge says it is at running temperature when it starts. pretty sure it is a ground wire chewed in two, any ideas? Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 17, 2019 Share Posted June 17, 2019 Probably the ground wire off the cluster chewed in two. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 17, 2019 Author Share Posted June 17, 2019 I was hoping you would say something easier to find. You are probably right. so far the only chewed wires were by the airbox, feeding the fuel pump resistor. Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted June 17, 2019 Share Posted June 17, 2019 See if THIS LINK helps with location. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 22, 2019 Author Share Posted June 22, 2019 No luck, ran the ground out to the engine compartment. No change. this thing is frustrating. I can't see all the gauges going bad at the same time. it has to be something they all have in common. Link to comment Share on other sites More sharing options...
Ωhm Posted June 22, 2019 Share Posted June 22, 2019 What Year?? Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 22, 2019 Author Share Posted June 22, 2019 No luck, ran the ground out to the engine compartment. No change. this thing is frustrating. I can't see all the gauges going bad at the same time. it has to be something they all have in common. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 22, 2019 Author Share Posted June 22, 2019 1990 Big Ton with 4.0 5 speed. Link to comment Share on other sites More sharing options...
rylee144 Posted June 22, 2019 Share Posted June 22, 2019 Hate to say it but did you check the fuse in the panel? Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 22, 2019 Share Posted June 22, 2019 You can test the individual sensors fairly easy. At least the temp sensor and the fuel sending unit. Link to comment Share on other sites More sharing options...
Ωhm Posted June 22, 2019 Share Posted June 22, 2019 Is Tach, fuel gauge and temperature gauge your only problems? Does everything else work just fine? Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 22, 2019 Author Share Posted June 22, 2019 voltage and oil pressure also. Link to comment Share on other sites More sharing options...
Jeep Driver Posted June 22, 2019 Share Posted June 22, 2019 Ground to the cluster is attached to the dash frame just above the hood release handle. Clean that ground.......improve that ground and every other ground on your truck. Do you have tilt wheel? if so is it loose? just curious. Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 22, 2019 Share Posted June 22, 2019 1 hour ago, Phillip Gwin said: voltage and oil pressure also. Then as said, clean the ground up first and/or do Cruiser's improvement. You may also want to pull the cluster and check the plug, circuit board, etc, as I've seen them get quite corroded or gross. The whole cluster comes apart fairly easily. Make sure the plug is seated correctly when it goes back together. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 23, 2019 Author Share Posted June 23, 2019 I pulled the Instrument cluster, it looked very clean. I will take it back apart tomorrow, clean it some more, and try again. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 23, 2019 Author Share Posted June 23, 2019 The tilt wheel is tight. This one stopped driving before parts wore out it seems. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 23, 2019 Author Share Posted June 23, 2019 I have this one and my CJ7 apart at the same time, so I am not able to give full attention to the Comanche. CJ is getting a Dana 300 (had a Quadratrack) so I get back to you after trying what is suggested. Link to comment Share on other sites More sharing options...
Eagle Posted June 23, 2019 Share Posted June 23, 2019 If you have the cluster out of the vehicle, you can run test leads from the sensors directly to the posts on the various gauges to test them. There are contacts in the one of the diagnostic port blocks for the tachometer. All the other gauges, I believe, have the same ohm range -- 0 to 88 ohms, -- so you could use a test lead setup from either the temp sender or the oil pressure sender to check them all. (Except volts -- but that's easy to test with a direct connection to the battery.) Link to comment Share on other sites More sharing options...
Ωhm Posted June 23, 2019 Share Posted June 23, 2019 On 6/21/2019 at 11:32 PM, rylee144 said: Hate to say it but did you check the fuse in the panel? No response yet. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 23, 2019 Author Share Posted June 23, 2019 The fuse is obvious, but I haven't checked it. will do that today. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 23, 2019 Author Share Posted June 23, 2019 here's the fusebox. fuse looks good. Link to comment Share on other sites More sharing options...
Jeep Driver Posted June 23, 2019 Share Posted June 23, 2019 13 minutes ago, Phillip Gwin said: here's the fusebox. fuse looks good. Actually, the entire panel does not look good. At the very leas you are going to have to get a test light and start tracking down circuits. Link to comment Share on other sites More sharing options...
Eagle Posted June 24, 2019 Share Posted June 24, 2019 1 hour ago, Jeep Driver said: Actually, the entire panel does not look good. At the very leas you are going to have to get a test light and start tracking down circuits. I agree -- that doesn't look very good. More important, the fuse panel is two parts. One part is on the engine side of the firewall, the part in your photo is the other side. To really investigate the condition, you need to remove the screw that holds the two halves together, separate them, and inspect those contacts. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 24, 2019 Author Share Posted June 24, 2019 Okay, I ran a jumper from the fusebox to the hot wire on the dash. It worked. I checked the fuse, it was good, that was in the evening. I went out today in the daylight, and the connector behind the fuse, the metal part was gone, it had copper color on one side, plastic on the other. I have jumpered around it. Will fix it right when I have more time to fool with it. Link to comment Share on other sites More sharing options...
Phillip Gwin Posted June 24, 2019 Author Share Posted June 24, 2019 Something tells me it's not the last thing I will find to fix. Link to comment Share on other sites More sharing options...
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