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My instrument panel lights and DIC flashes at random times , It occurs when its dry wheather or wet , cold and warm I get no OBDII errors and alternator and battery seems to be okay ((I measured this out).
I don't think its a lose contact because it does not do it always and it even start to flash on flat roads ...
I have read some where that this can be caused by a bad negative battery cable but how do you know the cable is bad ?

 

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I have read some where that this can be caused by a bad negative battery cable but how do you know the cable is bad ?
With the car running, measure from the battery post itself to the car's grounding point. You shouldn't see more than 0.1 volt. (I'm guessing on the value, but it should be really small.)

If your problem is confined to just the instrument panel, then I'd suspect something wrong with a connection to it. The battery cable usually affects multiple systems - like the radio and stabilitrack.

Edit: Revising my number to 0.01V. See this thread.
 
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