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More On Ford F350 Speedo Problems

Q. Hi Vincent, I just came across your site today. Very nice! I ran across the Q&A about a 1992 Ford F350 Speedometer Problems you answered. We get a lot of calls from customers that think their speedometer is bad when in fact it is not. In the 1992 to 1995 F series the problem the gentleman described was most likely a bad exciter ring in the rear end.

More On Ford F350 Speedo Problems

They go bad often and are very difficult to diagnose. You can tell because it will usually cause the speedometer to bounce at higher speeds but not at lower speeds. If it does it at low speeds or all over the band it is most likely a PSOM. Also, If the ABS light is on it is certain it is NOT the PSOM, assuming no other problems with the ABS, but wiring, VSS or the exciter ring.

The ABS module piggy backs off the VSS signal and has nothing to do with the PSOM. If you have any speedometer or radio circuit questions please don’t hesitate to call us, we most likely will have the answer right away. I think what you are doing is great! Good luck with the site!

Steve @ Dash
(888) 909-9473

A. Thanks for this information Steve! It will make pinpointing a speedometer problem a whole lot easier. I also added the wiring diagram for the speedometer and like you said, it applies to the 1992 to 1995 F and E Series truck.

More On Ford F350 Speedo Problems

Again, thanks for the contribution.

Additional Information provided courtesy of AllDATA

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