Outer Limits 4x4 Board

Hey guys,

Was hoping someone might be able to help me fix this fault.

My wife drives a 2004 Holden Astra and when ever you rev it about 4000 Rpm the dash cuts out total, this includes the radio.....
It returnes to normal when the Rpm lower below 4000..

Any Ideas?

Thanks in advance

It might be to keep the rear window from shattering

Just kidding. I don't know, those kinds of intermittent faults are tricky but if I had to guess, I would guess it's simple vibration. It could either be a common ground losing contact when the car is vibrating more or possibly the power side.

I would look at grounds then fuse box. But it is not inconceivable that a wire that's broken inside the insulation could cut itself out like this when vibrating a particular way. So it might be hard to find just with visual inspection.

If it's not vibration I can't think what it could be.

Thanks will check earth and visual on wires.

Cheers

what motor is it? i have fixed alot of 2.2 litre astras for the same problem and it has been due to the alternator overcharginging, the instrument cluster will turn off over a certain voltage to protect itself

It's the 1.8 Version.
We have had the alternator replaced due to failure to to long ago.
Maybe this one has started over charging and failed that way.

Can this be tested with multi meter?

Thanks

pm sent

Hey Guys,

Tested the alternator which was overcharging.
Now it's replaced under warranty. Woo Hoo!

Thanks for your help once again

Jason

Sorry for the slight hi-jack n_dorphin, but my wife’s 1.8 Astra also has gauge problems.
The Speedo stops working intermittently, when the Speedo stops working the radio/cd volume drops, but does keep working.
I have pulled the instrument cluster out and also the display unit in the centre and there appears to be nothing shorting or earthing out.
Any ideas.
Thanks
Pony

Pony:
This one sounds as if occasionally you are getting low voltage. I know that it is an intermittent fault (Bugger!) but when it happens, try loading the system even more eg turn on headlights and see how bright they are, or too the horn. This might help diagnose the problem if the whole system goes even lower. Failing that, switch off any other loads eg headlights and see if the display returns.

If this is the case, you may have a voltage regulator crook or you may have an intermittent short circuit which is overloading the whole charging system.