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Help! My speedometer quit working

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Old 05-08-2011, 11:58 AM
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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)

Last edited by code_red; 05-08-2011 at 11:58 AM. Reason: add on
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Old 05-08-2011, 12:00 PM
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First thing to do is check ALL of your fuses.. The speedometer is electronic.. Remember there is 2 fuse boxes..
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Old 05-08-2011, 01:14 PM
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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:
Click the image to open in full size.

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