scout4bta

Odometer quit last year, I can live with that. Last weekend speedo took 5 miles of driving before it started working. Then it bounced around plus/minus 10 mph for 5 miles then it started working correctly. Worked good for 150 miles then quit as I was going down the freeway. Nothing.
Checked VSS have pulsed signel.
have +5v on connector, (orange tracer) and using the black/blue wire for ground.
OD and shifting worked the whole time.
Can anyone think of any other ideas why it's not working before I drop the money on a used instrument cluster.

cougar

Check the drive adapter on the transfer case. They are prone to failure. Also check the wiring. I recently had to bypass mine from the VSS to the firewall.

maybe368

Cougar is spot on. Mine literally came apart and I was able to put it back together again, still working...Mark

scout4bta

Yes forgot to mention I did check the adapter, it's OK. Now what I don't know about is the drive inside the tail housing of the T case. It doesn't spin freely so I'm assuming it's OK.

dodgenstein

It usually isn't a case of the adapter in the transfer case spinning, rather the internal square drive rounds out.

scout4bta

didn't even think about that, I'll check that out.
thanks.

cougar

An easy way to check is remove the adapter and screw the VSS directly into the transfer case.

oliver foster

You can try to spin that square drive with a drill [slowly] and see if the speedo works as well.

scout4bta

Two more good checks, thanks cougar and oliver

scout4bta

Ran all the tests again and the latest, no response, so I'm going for a instrument cluster.

scout4bta

New spedo fix the problem.
I now have bragging rights for high mileage, odometer reads 274K instead of 140K

oliver foster

I am glad the new cluster I sent, solved the problem for you.