94 Silverado 3500 HD speedometer wont work

dspabout · 12-05-2008, 07:12 PM

What can be wrong with a speedometer? I've removed the panel and it is all electronics, no cable, I've cleaned thhe contacts, nothing helps.

Where is the speed sensor on the 6.3 ( 6.5?) diesel???
Thanks

468C10 · 12-06-2008, 12:45 PM

a sensor on the tail shaft of the trans?

fisher429 · 12-06-2008, 01:48 PM

Hi,

I replaced the speedometer cluster in my 1992 GMC bucket truck. I found a schemetic that told me basically how the system worked. There is a electronic sensor that counts the lobes on a gear type ring at the output of the transmission. This puts out pulses of electric current every time a lobe passes the sensor. This input is fed to a VSS ( Variable speed sensor) mine was located behind the glove compartment. The VSS converts the changes the pulses input to a different number of pulses output to allow for the difference in the rear end ratio and the size of the rear tires to make sure the speedometer reads correctly. There are jumpers in the VSS that are cut to calibrate it. This output is then fed to the guage cluster to operate the electronic speedometer.
Good luck on the restoration

12-05-2008, 07:12 PM	#1
dspabout Junior Member Join Date: Aug 2008 Posts: 8	94 Silverado 3500 HD speedometer wont work What can be wrong with a speedometer? I've removed the panel and it is all electronics, no cable, I've cleaned thhe contacts, nothing helps. Where is the speed sensor on the 6.3 ( 6.5?) diesel??? Thanks

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12-06-2008, 12:45 PM	#2
468C10 Full Member Join Date: Nov 2008 Location: motor city Posts: 10	a sensor on the tail shaft of the trans?

12-06-2008, 01:48 PM	#3
fisher429 Full Member Join Date: Feb 2006 Location: Indiana Posts: 11	Hi, I replaced the speedometer cluster in my 1992 GMC bucket truck. I found a schemetic that told me basically how the system worked. There is a electronic sensor that counts the lobes on a gear type ring at the output of the transmission. This puts out pulses of electric current every time a lobe passes the sensor. This input is fed to a VSS ( Variable speed sensor) mine was located behind the glove compartment. The VSS converts the changes the pulses input to a different number of pulses output to allow for the difference in the rear end ratio and the size of the rear tires to make sure the speedometer reads correctly. There are jumpers in the VSS that are cut to calibrate it. This output is then fed to the guage cluster to operate the electronic speedometer. Good luck on the restoration