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not a good idea to do a voltage test on a computer component, it can result in damage to the ECM. if only the speedometer is not working and the other gauges do work, the first place to start is the speed sensor, it is the most common issues with inoperative speedometers.
If everything else works ok, the vehicle drives normally, and all the other gauges are working then you may have a bad speedometer servo motor. This servo is what actually moves the speedometer needle to match the speed you are driving at. The cluster would need to come out and be repaired to fix this problem if this is the case.
Its a rear speed sensor on top of your diff case its around 30 bucks if you do it yourself only one stud/nut, the 99 durango does not have a speedo cable.
It sounds like you have a faulty Instrument panel Cluster (IPC) Your local dealer will have to confirm this as independant shops don't have the scanner capabilities for this diagnostic procedure.
I hope this helps.
Thank You,
Roy
Well odds are that your blazer is fixed by now. Either way sounds like a bad battery, that's why you need jumps all the time. Why it would die, there are too many possibilties off hand. So what was wrong with it?
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