Schrodinger
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| posted on 1/4/26 at 04:44 PM |
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Speedo and Tacho problem
My speedo and tachograph drop to zero when the indicator lights come on. All of my other instruments appear OK but they all move slowly and are
probably dumped so they do not show any movement as my indicators flash. All instruments are ETB, speedo, tachograph, fuel, oil pressure and water
temp.
I have just replaced the signal and earth wires on the two affected instruments but I still have the same problem. Can anybody suggest the next move?
Keith
Aviemore
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Slimy38
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| posted on 1/4/26 at 05:14 PM |
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Have you checked the earth on the indicators? If the indicators are managing to put 12 volts where it shouldn't be then other electrical thingies
could go wonky.
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gremlin1234
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| posted on 2/4/26 at 06:41 AM |
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certainly sounds like an earthing issue. (suspecting earthing fault in side light/ indicator bulb/housing )
can you please try:
does it fail on both left or right
does if fail with hazzards (rather than individual indicators)
is the battery fully charged?
can you try it with the side lights on
also are you using led or conventional bulbs?
edit to add
is the battery fully charged
[Edited on 2/4/26 by gremlin1234]
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gremlin1234
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| posted on 2/4/26 at 09:38 AM |
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thinking about this more, I currently suspect a fault in the common earth behind the dashboard.
as well as the tests in my previous post I suggest disconnecting the indicator 'tell tail' on the dash, to see if the fault continues.
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