Speedo quit working

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Jul 12, 2003 | 07:13 PM

grappledad

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Speedo quit working

I tore out the rear end in my '89 F150 and the speedo quit working. I rebuilt it and the speedo still isn't working...anyone know what the problem could be? I cleaned off the magnet at the top of the rear end and it still isn't working. Any thoughts?

Jul 12, 2003 | 09:32 PM

MustangGT221

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From: Topsfield, MA

Speedo quit working

Well, by not woring, what do you mean? Can you describe the problem more. Does the mileage display? Does it work AT ALL?

Jul 12, 2003 | 10:39 PM

82F100SWB

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From: Dryden, ON, Canada

Speedo quit working

An 89 has a mechanical speedometer, the VSS on the axle is only for the ABS system. Check the cable, it might have failed, or improperly engaged properly in the speedometer or gear in the transmission, or perhaps the gear itself may have failed.
Evan

Jul 12, 2003 | 11:28 PM

MustangGT221

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From: Topsfield, MA

Speedo quit working

Ahh yes, seems to me that I missed the 89'....it's usually the 92-96's that have problems.

Jul 13, 2003 | 05:54 AM

grappledad

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Speedo quit working

thank you guys i will check for a cable today.and see whats up.

Jul 13, 2003 | 11:34 AM

BBBTruck

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From: Connecticut

Speedo quit working

find the spec for the ohm reading across the sensor, check with an ohmmeter at the harness. If the meter replies over limit or nothing at all, there is an open somewhere in the circuit. If the ohmmeter replies 0 ohms, there is a dead short. If you obtain a decent reading, shake the cable to see if it is broken inside. If this checks out, move to the next harness point and repeat process.

Jul 13, 2003 | 05:38 PM

steve83

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From: Memphis, TN

Speedo quit working

BBB
It's not an electronic speedo.

dad
If the cable is worn, it has probably put so much stress on the plastic gears in the transmission tailhousing that one or both are stripped. That's what happened to mine, and it's why I converted to the electronic speedo (PSOM) that has already been referenced. It takes some effort, but I think it was well worth it. The gears are ~$8ea and the cable is ~$40.