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Intermittent speedometer--temperature related. Does something need resoldering? 700

posted by  ksb740 on  Wed Nov 29 16:50 CST 2006
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last visit: Fri Mar 6 16:38 CST 2009
[RELATED]

Hi Blue Horse.

You didn't mention any other guages being affected, so I don't if you have the same issue I fixed a couple years ago. This was the situation on my 87 744t as temps dropped below 45 F:

Headlights off, no problems.

Headlights on...
no instrument or panel switch lights
speedometer, fuel guage and clock did not work
voltmeter and coolant guages did not register correctly
both dash turnsignal indicators were lit
high beam indicator was lit (high beams were not on)
all was well once the cabin warmed up (usually took 7-10 minutes)

I don't recall how I traced the issue, but I deduced that the dimmer unit was at fault. I was considering just to bypass the unit altogether but decided to first open the unit up and take a look at it. All I did was take off the back metal cover and remove the circuit board from the unit. The solder looked fine but there were a couple spots of corrosion that I just scraped off. I then put the circuit board back in. I can't remember what, but the metal cover was sitting awfully close to some contact on the circuit board and I was thinking perhaps it may have been flexing against the circuit board in colder temps, causing a short somehow. So, I left the cover off.

That's all I did, nothing else. No problems for 2 winters now. Test things out with headlights on and off. Hopefully, you have the same issue I had.

Kevin





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