Question about GMC Jimmy
I installed a new heater core. After re-assembly, the instruments are not working. Tach, spedo, fuel, oil, temp and volts, all not working. All else seems OK. Dash lights, dimmer, self test when the ignition it turned on, etc all seem to be working. All fuses are OK. One fuse, labeled Crank, has no voltage on either side of it and that is not correct...need some guidance to troubleshoot this problem. Does anybody know this car well enough to talk me through diagnosis?
If your car worked well before the heater core replacement but doesn't after then it is logical to say that some where in the re-assembly of the system there is a connection that has not been fitted correctly or and earth wire that has been missed . Harnesses can be pulled or twisted in the process and it is so easy to dislodge a connection or put the wrong plugs together. Go back over what you did step by step to find the error.
Posted on Jan 03, 2014
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Posted on Jan 02, 2017
Behind the dash is what they call a constant voltage regulator. It controls the guages. It's small and located behind the dash near speedo.
Posted on Jun 19, 2008
the battery says 12 volts but may be dropping to 4 or 5 under a load...i would suggest jumpstarting the car and see what happens.the battery should read in the high 12 volts and not less than 9.5 under cranking. the dash lights go out on your car when starting,and the alarm will go off ,and disable the ignition if the voltage is too low in cranking the car because the computer will shut it down and activate the anti theft.....check your battery posts are tight. best of luck
Posted on Jul 22, 2009
I have a 98 Wrangler - same problem. Dash gauges would work, then out (airbag light came on). Then it would work for a week or two than out.
Tried looking at fuses, wires, aftermarket radio problems, etc.
When I pulled the instrument cluster out of the dash, I noticed a lot of goop (lubricant) on one of the cluster plugs. So I wiped it off with a paper towel and now everything works. Maybe too much goop was shorting stuff out? Anyway, I'll know in a couple of months if that was my problem or not assuming my gauges keep working uninterrupted.
Posted on Aug 05, 2009
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