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Gents, I need help. Ill try and be brief but at this point Im pulling my hair out.
the electronic Speedo is not registering any speed at all. The light comes on, the odometer is on but not registering any mileage. I even see the Speedo needle jump during the start up ignition sequence.
what I have done to try and fix it.
1. replaced the VSS
2. checked the voltage regulator connection for oil. It did have oil in it. Cleaned it and reconnected it.
3. checked battery voltage. Approx 12.5 Volts at idle. Approx 14.6 V at 2000 rpms.
4. Checked battery connections for tightness. Good to go.
5. checked electrical regulator. Nothing obvious. Pulled it and nothing at the speedo, put it back and the power came back to it.
at this point, Im running out of ideas. My gut is telling me that the Speedo is working and its just not receiving a signal for some reason. Im open to all suggestions and questions.
You can view and/or download a color wiring diagram at the Harley SIP and test to see if the speedo is getting 12V power. Mine wasn't and the diagram was a big help for troubleshooting.
Free registration is required to use the SIP and well worth it, lots of useful info there...
I appreciate the links. Ill be looking into it at home tonight.
Any suggestions on what could possibly be the issue?Wiring between the Speedo and the connection under the seat? Something wonky in the connection inside of the Speedo itself?
check if the connector in the speedo is seated well (I once had a bent pin in the speedo connection)
check continuity on all wires (R, W and B) from the speed sensor to the speedo
check continuity on B/Y wire from the ignition module through the 12 points connectors to the speedo
I really appreciate the list. Im not an electrician by trade so i am slowly digesting the schematic. That certainly helps narrow it down. Unfortunately I dont think it lends to any easy fixes. We shall see though
So checking continuity is not a favorite activity for sure.
assuming Im doing this correctly. With a setting of 200 Ohms on my multimeter, I am getting 0.2 or 0.3 readings on the black, red and white wire. Does that sound correct?
Hopefully not related. Is this rust something to worry about?
Did you check continuity at the wiring from the speedsensor towards the speedometer use the pmeasure locations as indicated in the drawing below?
FYI: the black bars in the wiring diagram represent the connectors
Last edited by FXD2003Rider; May 29, 2026 at 01:26 PM.
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1999 Dyna FXD Speedo out.
