mrmel2you Posted March 28, 2018 Share Posted March 28, 2018 I have a '90 MJ, just installed full gauge cluster from an '89 XJ. Replaced water temp' sensor and oil pressure sensor (both say for gauges). Installed the gauge cluster, nothing is working right. Water, oil and fuel gauges are pegged all the way to the right of their gauge readings. Tach' barely moves above "0"rpm's at idle. Check both sides of fuse #17 (gauges) for voltage, checks out OK. Checked and cleaned all connectors and grounds, get the same readings from the gauges. Illumination, turn signals, high beam, seat belt lights all work. First picture shows the cluster before I installed it. Second picture shows it placed it the dash opening connected and engine at idle. Voltmeter seems to work somewhat, still not 100% right though. Any input as to what might be wrong or is it something that I'm overlooking here? Many many thanks in advance, Papa Mel Link to comment Share on other sites More sharing options...
DirtyComanche Posted March 28, 2018 Share Posted March 28, 2018 Bad ground. Link to comment Share on other sites More sharing options...
Big Dan Posted March 29, 2018 Share Posted March 29, 2018 13 hours ago, saveevryjp1998 said: What did it come out of? What did it go into to? 2.5 to 4.0 visa versa? That won't/shouldn't effect anything. Especially not in the manner he is experiencing. EDIT - the engine shouldn't matter. The year will. I didn't read thoroughly. Link to comment Share on other sites More sharing options...
mrmel2you Posted March 29, 2018 Author Share Posted March 29, 2018 '90 MJ, cluster is from an '89 XJ. MJ has the 2.5----unsure what the XJ had. I checked and double checked the #'s for both the oil and water---both check out for '90 MJ with the 2.5 (gauges)----same #'s for an '89 XJ. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 29, 2018 Share Posted March 29, 2018 How's the printed flex circuit foil look on the rear of the cluster? All nuts tight where it connects on the studs? No tears, open traces, torn foil? Inspect it carefully.... Link to comment Share on other sites More sharing options...
mrmel2you Posted March 29, 2018 Author Share Posted March 29, 2018 I pulled both printed circuits and used a lamp from behind and looked through a jewelers loupe. Checked every circuit, no breaks/ cracks/ separations----not even so much as a scratch to be seen. Cleaned all contact points and tabs with an eraser, finished with Q-Tips dipped in alcohol (rubbing, not drinking---that would be alcohol abuse) LOL :) Cleaned both connectors in the dash that plug into the cluster. Cleaned the ground connections, one under the dash, one on the firewall next to the fuse box and the one on the firewall next to the MAP sensor. Cleaned both ends of both battery cables. Put the cluster back in, now the oil pressure gauge is working and so is the volt meter. Tach' stays at "0"---until I step on the pedal, water temp' and fuel gauge are both pegged way to the right of the gauges. Going to tap into the ground wires from the large connector and run a ground wire from there to the firewall and see what happens (may run it to the battery). Other than what I've done so far----I'm at a freakin' loss and at my wits end with it. Many thanks for all the help you fellas have given me on this, Papa Mel Link to comment Share on other sites More sharing options...
Ωhm Posted March 29, 2018 Share Posted March 29, 2018 16 minutes ago, mrmel2you said: Tach' stays at "0"---until I step on the pedal, water temp' and fuel gauge are both pegged way to the right of the gauges. Does water temp and fuel gauge peg with Key On only (not cranking)? Try disconnecting the IGN Module to see if Tach is pulling the circuit low. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 29, 2018 Share Posted March 29, 2018 Where did you get the new full-gauge Renix cluster? Junk yard, Ebay, ? Might be best if you tried another cluster at this point... Link to comment Share on other sites More sharing options...
mrmel2you Posted March 29, 2018 Author Share Posted March 29, 2018 Bought the cluster ($70) from a fellow MJ'er, said it came out of a running '89 XJ. Will try the IGN module tip :) Water and fuel gauge, key on---needles go to max reading, running---needles go way past. Tach' needle barely moves until I touch the gas pedal. Thinking this cluster is crap and about to put the old one back in. Link to comment Share on other sites More sharing options...
Ωhm Posted March 29, 2018 Share Posted March 29, 2018 If you can just pull pin C213_C (green w/tr), three pin connector at IGN Module, vehicle will START. Link to comment Share on other sites More sharing options...
mrmel2you Posted March 29, 2018 Author Share Posted March 29, 2018 Found the C213 connector at the IGN module, opened the lock cover, pulled out the dust boot on the green wire w/ tracer-----is there a secret/trick to getting the wire out? Can't see where the little lock tab is located on the pin. Link to comment Share on other sites More sharing options...
Ωhm Posted March 29, 2018 Share Posted March 29, 2018 Special Tool: Link to comment Share on other sites More sharing options...
SatiricalHen Posted March 30, 2018 Share Posted March 30, 2018 I’m not much help probably, but I put a 90 xj cluster in an 87 mj. Everything worked once I got the right oil and water sender. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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