| Steve Gallegos |
07-09-2017 01:33 PM |
VDO electronic speedo bounces
My electronic VDO speedo is bouncing from 20 t0 50 then down to 0 then back to 50 up to 100 then down to 40. What do I need to do to fix it?
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| strictlypersonl |
07-09-2017 01:38 PM |
Did it ever work correctly? If not, I would first check the gauge grounds, then replace the transmission sender.
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| Steve Gallegos |
07-09-2017 01:54 PM |
It started do this about a month ago, before this time it worked fine.
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| strictlypersonl |
07-10-2017 05:39 AM |
It's more likely to be the gauge, but I'd first check that the wiring is intact, including power (and ground) to the gauge and the connection to the sender.
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| Ron61 |
07-10-2017 06:06 AM |
If you have the one that you can adjust by just driving a mile, then check your three leads to the speedometer from the transmission. I had that same problem with mine and the trigger lead had gotten loose. I ran three new leads and never had a problem after that.
Ron
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| Grey 65 |
07-11-2017 11:58 AM |
You get this resolved?
Kevin.....
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| cycleguy55 |
07-11-2017 01:23 PM |
Quote:
Originally Posted by Steve Gallegos
(Post 1425675)
My electronic VDO speedo is bouncing from 20 t0 50 then down to 0 then back to 50 up to 100 then down to 40. What do I need to do to fix it?
|
Mine did that too - until I put in a dedicated ground wire from the alternator to the external voltage regulator, as well as cleaning up some other grounds in the car - including the main ground from the battery to the frame. |
| Steve Gallegos |
07-12-2017 11:14 PM |
not resolved yet, but I will try some of the ideas people have posted. Thanks for the ideas.
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| cycleguy55 |
07-13-2017 09:33 AM |
BTW, I had flickering lights at idle that were diminished but not completely eliminated by the work I did on various ground points. Replacing the 1G alternator with a 3G alternator eliminated the idle flicker, plus a significant reduction in voltage drop when the cooling fans cut in. I would highly recommend a 3G alternator swap, unless you need the period correct look of the 1G alternators.
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| Gaz64 |
07-13-2017 05:10 PM |
Quote:
Originally Posted by Steve Gallegos
(Post 1425675)
My electronic VDO speedo is bouncing from 20 t0 50 then down to 0 then back to 50 up to 100 then down to 40. What do I need to do to fix it?
|
Does this happen only when moving, or while stationary?
I would back out the signal wire, if it still does it over bumps etc, then the signal wire is getting falsing triggered, or is shorted to ground etc somewhere in the wiring. If the speedo stays on zero, then the wiring is ok.
Then start looking at the speed sensor, drive/driven gears etc.
Gary |
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