Is there any way to fix the short in the odometer? I know at least two other people with this same issue. Its hard to track mileage or even figure your MPG when you can only see the odometer light up sparatically. Thanks, Nate Same issue: odometer turns off and on with at random. Where I get my oil changed they stated that nearly all older Exepditions have the same problem. You would think that a recall or service bulletin would be in order!?
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Thank yo very much for the details. So the next three times that the engine light came on and you replaced the same spd sensor, did you reread the engine code to make sure it was still the same code? Unfortunately it sounds like you have a short in the wiring harness. You really need a scan-tool to go further, sorry. There are three wires one should be ground, one should be 5volts power, and the other is 5volts reference return to ECM. I'm sure if you had one you wouldn't be asking me for help but if you have a repair manual and a multimeter you may be able to narrow down the search or find the problem. Electrical problems can be so stressful. But you know the code, you know what it is affecting, now you just need some luck and track it down. Let me know if I can be anymore help.
Since everything else is still working, your odometer just crapped out. This is very common on the Vics/ Marquis that utilize the mechanical style odometer. I've had two of them (1989 and 1991 Grand Marquis) where the odometer failed. You will need to remove the odometer from the instrument cluster and either replace it with a new unit (good luck with that) or send it out to be repaired. There's a guy that does this specific type of repair, search the Internets and you'll find him.
Side note: Since it was only the main and not trip odometer that failed on my two Panthers, I learned my lesson the second time around and just kept track of my mileage using my trip odometer and a pen and paper in the glove box. A lot easier than tearing the dash apart at the time. If it happened now on my current car ('94 Vic LX), I would fix it. It's not a really hard repair if you know what you're doing or can find someone who does to give you a hand.
Sounds like you have a universal failure of your instrument panel circuits. The Speedo and odometers run off a cable that goes down into your tranny, not electrical.
Pull each fuse out one at a time, test each for continuity, clean the blades with an eraser and reseat, then go to the next one. Tighten all the ground cables you can find, starting from inside, then the firewall, engine block, battery, etc. This should fix it unless you have an open in the instrument circuit. A short will blow the fuse involved so that will be obvious. Just replace the blown fuse with the SAME VALUE- DO NOT USE A HIGHER AMP FUSE! If you have a blown fuse, hopefully you'll be lucky and it won't blow again.
I say check each fuse because sometimes instrument circuits are shared with others and not obvious which fuse is the one. And if one fuse is not making good contact, then others are likely to be on their way. If it is a short it will work momentarily until the fuse blows- thats why they're in there- to protect the circuit.
If you have a short you will have to track it. Take the blown fuse out and run your tests on your wires- most. Sometimes those little instrument lights get a bad connection- glazed contacts & sometimes they act as sub-fuses as well, so it can get complicated. This is my generic solution for most vehicles.
Good luck hope this helps.