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240 Speedo Question 200 1986

uid 1's pic
posted by  JSBB on  Sun Sep 8 12:55 CST 2002
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last visit: Thu Oct 23 14:42 CST 2014
[RELATED]

The speedometer went out on the wagon a few weeks back. I finally got around to trying to see if I can fix it. What I tried:

  • Continuity between the speedo head wires and the sender connection. OK
  • Ohm reading of sender at rear connection. 3.19 k Ohms. This is outside the range indicated in the Bentley book.
  • drove around with the voltmeter on the sender wires on the instrument cluster. It was roughly 3.5mV at 15 MPH. It did rise with increase in speed.
  • Removed speedo from instrument cluster to inspect the plastic gears. They look fine.

    I was reluctant to take off the sender. Also, I did not check the clearance of the sender.

    Given this information, what advice can anyone give me? I'm thinking I'll just take it to a mechanic on this one. But I fear they'll go the expensive route, when a simple approach would do just fine.

    Thanks.

    -JSBB






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