electrical fault?

i have a 1996 1.6 vauxhall tigrs Bermuda, i have just replaced the battery as it was completely flat , now the dash lights on the car have a life of their own . i broke down the other day after the electrics went mad and the car died! the battery now wont hold any charge! im at a loss and can only guess it must be an electrical fault as when my new battery was fitted it was tested and taking charge so it cant be the alternator, can it? Help!

melanie
December 2007