1999 f250 speedo not working o/d light flashing please help

aariz82 · #1 (**permalink**) 01-25-2011, 07:38 PM

Couple of days ago i started the truck and when i started to drive the speedo was not working and when it shifted into 2 or 3rd the o/d light started to flash it shifts smooth. So did alot of research and people said to change the abs/vss on the diff so i did that nothing happened. Do you guys think i should change the oss which is 50 bucks from ford part# F81Z-7M101-AA. Also 2 days ago randomly the speedo worked and o/d light stopped flashing and i thought everything was fine then it happened again. I need some help guys.

***JSchuricht*** · #2 (**permalink**) 01-25-2011, 09:46 PM

Check the wires to the VSS, sounds like one is broken.

aariz82 · #3 (**permalink**) 01-26-2011, 05:17 AM

How should I check it?

aariz82 · #4 (**permalink**) 01-26-2011, 05:52 AM

i checked the wiring harness coming off the vss with a voltmeter and got a reading of 4.9v is that what its suppose to be?

aariz82 · #5 (**permalink**) 01-26-2011, 06:14 PM

Please need help and info I have done alot of research but nothing helpped.

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