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How Fast Am I Going?

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Old 04-07-2012, 10:10 PM   #1
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How Fast Am I Going?

On my recently acquired 1993 Cummins, the speedometer doesn't work. The sending unit at the t-case is hooked up. I hooked a slow drill up to the sending unit. Nothing. Where should I start checking?
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Old 04-07-2012, 10:14 PM   #2
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The plastic gears behind the speedo and in the transfer case could be bad, mine was compleatly stripped, and possibly check the pcm, it might be going bad
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Old 04-07-2012, 10:23 PM   #3
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Quote:
Originally Posted by Lunds Ram View Post
The plastic gears behind the speedo and in the transfer case could be bad, mine was compleatly stripped, and possibly check the pcm, it might be going bad
What is the pcm? When I hook a drill to the sending unit (acts like gears in t-case) nothing happens.
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Old 04-07-2012, 10:28 PM   #4
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The pcm, I don't denver what it stands for, is kinda like a brain, its in the left front fender by the battery and horns check the sticky on how to test it, and if it checks out then its probably the gears behind the speedo, sticky also has info on repairing and sourcing the gears
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Old 04-07-2012, 10:41 PM   #5
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Please excuse my newbieness.

What's a sticky?
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Old 04-07-2012, 10:47 PM   #6
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https://www.dieseltruckresource.com/...t-t102027.html this is the sticky it has alot of information on how to
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Old 04-07-2012, 11:08 PM   #7
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PCM = Powertrain Control Module

Located under the driver side fender, behind the battery.

Controls, cruise, speedo, plus many more.
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