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Cattle Boards
Trucks, Tractors & Machinery
electronic speedometer
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<blockquote data-quote="DiamondSCattleCo" data-source="post: 657014" data-attributes="member: 2862"><p>Before you start yanking speedometers, check continuity on the wires running from the sensor to the powertrain module. Wiggle the wires while checking continuity, as I've seen plenty of Fords with rotting harnesses back there. With the continuity gauge wailing away, wiggling the harness would simulate bumps and the continuity tester would blip. If that checks out buy a new sensor or use a sensor from a truck that you know works. They can develop intermitent issues and will sometimes function, sometimes not. They're nothing more than a Hall-Effect sensor, so they will lose magnetism over time, leading to intermitent functioning issues. Only after you've eliminated all of the above do you start digging into expensive modules.</p><p></p><p>Rod</p></blockquote><p></p>
[QUOTE="DiamondSCattleCo, post: 657014, member: 2862"] Before you start yanking speedometers, check continuity on the wires running from the sensor to the powertrain module. Wiggle the wires while checking continuity, as I've seen plenty of Fords with rotting harnesses back there. With the continuity gauge wailing away, wiggling the harness would simulate bumps and the continuity tester would blip. If that checks out buy a new sensor or use a sensor from a truck that you know works. They can develop intermitent issues and will sometimes function, sometimes not. They're nothing more than a Hall-Effect sensor, so they will lose magnetism over time, leading to intermitent functioning issues. Only after you've eliminated all of the above do you start digging into expensive modules. Rod [/QUOTE]
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