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speedo signal comes from the abs unit. if there is no problems from the abs unit. it would be the signal from the ecu to the speedo but if you have speedo wave the signal is being interrupted. i.e sunroof. windows and the signal goes around these before it gets to the the speedo. if the speedo does not move when you turn on ignition then the problem is at the dash end as no power to the speedo this could be the connection that the dash sits on.
The sensor it at the end of the transmission, last one at the drive shaft. Drivers side. It most likely is that. could be wiring also. You need a multi meter that reads hertz to see if it is the sensor.
Hi Spike the vast majority of speedometer issues is caused by the speed sensor and or the wiring. On Sportsters the sensor is located on top of the engine case behind the rear cylinder, on big twins it's located on the right side of the transmission case between the starter end cap and the transmission top cover. Remove the bolt/screw that secures the sensor and lift the sensor out of the case. Inspect it for damage and contamination, if there appears to be no damage wipe the end of the sensor clean and reinstall, you can go for a short quick test ride to see if the speedo is working. If the issue still exists grab your test light and unplug the harness connector from the sensor, check for power (red wire) and ground (black wire) continuity coming from the speedo, there is also the connector that plugs into the speedometer, also look for corroded, broken or loose pin/sockets. If everything checks out OK then replace the speed sensor. For more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at firstname.lastname@example.org. Good luck and have a nice day. Harley Check Engine Lamp DiagnosticsHarley Davidson Manuals Mark Workshop
Do you mean by the speedo head the VSS or vehicle speed sensor that is on the tail shaft end of the gearbox with two wires coming out of a connector and which sends an electronic signal to the instrument cluster which displays a reading onthe speedo?
Try looking at the far end of the transmission just before the drive shaft (on the driver side). The sensor is a tiny piece of plastic screwed to the transmission by a (10 mm head) screw. It is a round cylinder inside the transmission. Also connected to the plastic piece is a wire that is about 1 foot long to its connection.
The speed sensor actually won't slide out since the floor board is in the way. It is necessary to remove both cross-members of the drive shaft and leverage the shaft down to slide the sensor out (3/4" wide by 1" long).
Could be that speedo cable has become disconnected or that the inner shaft has broken. The speed cable is connected between the back of the instrument cluster and the left side of the transmission. Check under the car that the cable is securely fitted to the side of the transmission. Disconnect it and and check on the condition of the square drive flexible shaft. The spinning of this inner shaft is what conveys the output shaft speed of the transmission to the instruments. The instrument cluster can be removed but pushing a length of coat hanger wire with right angle turn on its end between the the cluster and the dashboard surround. Turn the coat hanger to hook behind the cluster and pull forward to remove it. Try several points around the cluster. It is best to disconnect the speedo drive cable to withdraw the cluster (after electrical connections have been disconnected. check that the speedo cable is secure to the back of the instruments. If you remove the cluster completely follow the path of the speedo cable. If you have to replace the cable, tying a length of string to the speedo cable end first and posting the string down the cable path will help the re-installation enormously. Simply pull the string whilst reinstalling the instrument cluster until the end of the speedo can be got hold of. Refit the speedo cable to the transmission only after the instrument cluster is back in place.
Hate to tell you but your gonna have to redo everthing you did and recheck the speedo cable. Make sure you didn't stripe it or the gears inside the speedo and make sure its correctly installed and not kinked anywhere.
Now for the real scary part the other end of this cable goes into the transmission's output shaft. If you find that the cable's end at the speedo gauge and the gauge its self is a-ok ...then you have to inspect the cable at the tranny end and the gear it goes to. If cable is worn no big deal ( you buy a new cable and install) but if gear is worn Uh.. have to replace outputshaft on tranny to repair gear.
I'm hoping you didn't correctly install cable on speedo.
The gear that is on the side of the transmission has a small seal, where the speedo cable goes into the speedometer take-off unit. When the seal goes bad, the cable drags trans fluid up the inner core. I have changed this device several times for the same symptom. Replace the speedo unit on the side of the transmission.
Your Trans should be the 4L60. If your speedometer quits working and the truck won't shift out of 1st gear, the "Speed Sensor" is probably bad or the wiring is bad where it plugs into the sensor. The sensor will be towards the back of the trans or on the tail shaft. An easy way to test if the wiring is bad at the plug is to pull on the wire 3" or 4" from the plug and watch closely to see if it stretches. If there is any stretch the wire inside the plastic sheath is broken.