Dash/speedo and battery problems

[LukeVESV6]

Hey guys, I own 2008 VE SV6
So I recently just had my alternator changed started her back up and everything was all good.
Then the dash and the electronics on the speedo started going off and on everytime I accelerate it would turn off then as I slowed down it would come on.
Also is telling me when I would brake "brake" then straight after "contact dealer" then quickly go off the car is still driving alright just my electronics are playing up,
Also when I just turn the car on it says "service charging system" also has the battery sign and says low battery whilst im driving
Any ideas of what it could be exactly cheers.

 

[gossie]

Is it the battery?
How old is it?

 

[Dayvo]

When the battery gets old and low on charge it can cause all sorts of problems

 

[Jolls]

I am assuming that the alternator is charging the battery and this has already been checked.

I would check the earth associated with the instrucment cluster and the battery then get a load test done on the battery. At least then you have a known baseline.