Help! My speedometer quit working
 

I have a 1995 F150 , 302 , 5 speed trans with 119,000 miles on it. My speedometer quit working on me about a week ago and I avnt a clue where to look 1st for fixing this problem. Any help will be gratefully appreciated, thanks (Oh this is my son truck)

First thing to do is check ALL of your fuses.. The speedometer is electronic.. Remember there is 2 fuse boxes..

If fuse #8 & #18 are good then:
NOTE:
Only wiring harness end of connector is to be probed.

Connect Digital Volt-Ohmmeter to Pin 4 (speed in +) and Pin 5 (speed in -).

Does the voltage increase smoothly and continuously from 0 to approximately 3.5 volts as vehicle speed increases from 0 to 48 km/h (0 to 30 mph)?
OR,

If available, a frequency counter may be connected to Pin 4 (Speed in +) and Pin 5 (Speed in -).

Does the displayed frequency of the signal increase smoothly and continuously from 0 to approximately 667 Hz at approximately 48 km/h (30 mph)?
OR,

If neither a voltmeter nor frequency counter is available, vehicle speed control may be used as a good indicator. If it works normally, then the speedometer module is at least receiving a speed input signal and the wiring and sensor can be assumed to be good.

A wiring diagram:
http://i54.photobucket.com/albums/g9...SSF-series.jpg

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