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Old 06-13-2021, 06:14 PM   #1
below the surface
Join Date: Aug 2013
Location: New Orleans
Default Intermittent speedometer & odometer

1986 246

My speedometer cuts out randomly and when it does the odometer also stops working. I thought it might be the gear initially but the gears are fine (replaced the gear previously).

A good whack on the dash will often restore functionality, but typically only for a little while. Sometimes it will only work for a few seconds before cutting out again.

I have reflowed the solder joints on the odometer motor wires, the three pin internal connector, and the three pc board tabs for the external connector multiple times. I took a file to the pins on the external connector. I have sanded the tab for the single wire connector. I have sprayed everything with DeOxit multiple times. This typically gets it working again but it doesn't last and the intermittent behavior begins again.

I have tightened up the three pin internal connector multiple times as that was my top suspect. No change. Today I tried soldering some wires to provide an additional parallel connection for the internal three pin connector, but this didn't make any difference.

I have looked around for any cold solder joints, cracked solder joints, or anything else suspect but haven't found anything yet. I saw this topic discussed in some other threads and it definitely seems to be an electrical issue.

What are some other areas that to check for flaky electrical connections that might be causing the problem? Maybe just reflow all solder joints on the board?
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