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Old 10-26-2013, 07:24 PM
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Speedometer not registering

I have read up on most of these forums but still cant solve this issue. my speedometer, cruise control, and odometer are not working. I have replaced the VVS on the rear diff with a NAPA VSS twice. (to make shure I didn't get a bad part) I have traced the wiring harness and didn't see any chafing through the conduit so assumed it was good. Checked the fuse, don't have any of them blown. plus when I turn the key the speedometer moves from pegged (below zero) to registering at zero mph. the odometer also turns on and shows the total mileage before it stopped working. The reset button works on the odometer as well. Just to make shure I went to a junk yard and pulled another speedometer and swaped it out. no luck. (that one didn't even turn on) so I put the original one back in the truck. I changed the rear diff fluid and check the ring in diff and all looked normal. just old gear oil. put new oil and still no luck. I don't have a ABS light on at all (never did). I cant think of anything else that is involved in the system. any help or input would be greatly appreciated. thanks in advance.
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Old 10-26-2013, 10:43 PM
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As of now, does the odometer still display the pre-failure mileage number, or is it blank?
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Old 10-27-2013, 12:29 AM
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Don't assume that the wire is good because the tube looks good. To test the wire, disconnect both ends and attach one wire to ground. Attach the other end of the wire to your multimeter and the second multimeter lead to ground. Set the meter to ohms and look for a open circuit. Repeat with the other wire. Alternatively you could run a temporary wire to eliminate the stock wire. Also check the connector at both ends for corrosion or a loose connection.
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Old 10-27-2013, 08:29 AM
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Quote:
Originally Posted by madpogue View Post
As of now, does the odometer still display the pre-failure mileage number, or is it blank?
yes it will display the pre-failure mileage. the trip selection reads zero because the odometer doesn't move. (I reset it hoping it might do something). I can still flash between those two screens on the odometer.
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Old 10-27-2013, 08:34 AM
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Quote:
Originally Posted by JSchuricht View Post
Don't assume that the wire is good because the tube looks good. To test the wire, disconnect both ends and attach one wire to ground. Attach the other end of the wire to your multimeter and the second multimeter lead to ground. Set the meter to ohms and look for a open circuit. Repeat with the other wire. Alternatively you could run a temporary wire to eliminate the stock wire. Also check the connector at both ends for corrosion or a loose connection.
I will give this a try. the speedometer connection, center connector behind the cluster, has several different ports. any idea which one to test? Or should I test the wires at the fuse box before it goes to the actual gauge? thanks
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Old 10-27-2013, 10:17 AM
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Have you recently installed a new stereo or been behind the dash? I helped a buddy install a new stereo a couple months back and when we put it all back together he his speedo and OD weren't working. Did a little looking and one of the wires you don't use on the wiring adapter for the stereo was grounding itself on something... Taped off the ends on all the unused wires and all is good now. First time I've had that problem...


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Old 10-27-2013, 06:22 PM
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I don't have a multimeter yet so I have not be able to test the wiring. however I did look at the stereo and all the loose wires were secured, and not touching anything else. (I put a new dash pad in today so it was an easy thing to check). I disconnected the wiring from the vss in the diff and that immediately triggered a ABS light to turn on. I plugged the vss back up and the light went off too. I was wondering if that has any indication of the wires being good? again the only reason I haven't actually tested the wires is because I don't have a multimeter yet.
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