Thread: 740 Speedo :(
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Old Jun 22nd, 2021, 11:43   #6
natmargetts
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Last Online: Today 00:33
Join Date: Dec 2019
Location: Fleet
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Morning both-

Bob:
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Thanks for the update on what you have done Nat. Was the gear wheel part stripped?
Yes- one of the teeth had broken off- its the classic problem with resetting the odometer while moving I think- this was a blight of the previous owner though. I tried one of the £10 kits off ebay but the gear was too small (diameter, the teeth count was correct). Had to buy one from Germany for £25!!

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I have even found that the tightness of the 2 screws on the stepping motor can be problematic
I wouldn't even know where to begin with this!!

Mr Scooby:
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Assuming the other instruments continue working
Aye
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Does the car have ABS?
Nay
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power is still getting to the speedo so that only leaves the signal
Agreed. I have redone the connection to the diff sensor in the past and have checked it recently using an Arduino while driving the car so I know that it is fine.

The symptom of me smacking the dashboard which causes it to come back to life suggets that it is something in the cluster / board itself regarding the signal - but it is hard to isolate when the problem is intermittent- I've tried my best to check as many of the blue plastic traces as possible for continuity and all seem fine! Losing my mind!
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