Bad ignition switch?
Sounds like a problem in the ignition switch. When the gauges do not come on, how about the warning lights and the check engine light? If they don't turn on also, it may be a problem between the switch and the portion of the instrument panel fuse block that the switch sends power to in run or start-and then on to the dash for the gauges and warning lights.
You could check for power on the gauges fuse with key on. With the key in on position, all fuses in the instrument panel should have power to them. Check the fuses for power when the gauges do not come on. If no power in run, either the switch is bad, or however the switch sends power to those fuses (the ones called "hot in run or start") is not working. On some, the ignition switch's run wire trips a relay which sends power to the fuse panel. You would have to see a wiring diagram to see your set up. But it sounds like the problem is the switch or the wiring after it, not an engine sensor problem.
To check if a fuse has power, use a test light. Find a good ground for the test light under the dash, turn key to on, and use the needle probe of tester to probe the little indents on each end of the top of the fuse-these are test ports to check for power. A good fuse will light the tester on both ends of the fuse. A bad fuse (blown) will only light the tester on one end of the fuse-the metal strip inside the fuse has blown. Just check if all your fuses have power on them with the key on. Check them when the gauges don't work. IF no power, switch is bad or it is not turning that portion of the fuse panel on for some reason.
Apr 10, 2014 |
Jeep Grand Cherokee Cars & Trucks