1980 300SD Speedo cable voltage??

1980 300SD the speedometer cable gets very hot in a short period of time and starts smoking? What is going on? Very Strange. Any ideas?

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Body and Interior Specific Aid

Chassis Model Number

W116

Addendum

With the speedometer cable detached from the instrument cluster, I have 12+ volts to ground from the cable. How can this be????????

Find source of short

There must be a direct short to the cable somewhere. Start by pulling fuses one at a time while checking voltage to see what circuit might be involved. That is a new one on me... :-)

I put a ground wire to the

I put a ground wire to the engine and fixed the problem.