Thank You for your help.....The "new" battery is an EXIDE PREMIUM 72V.The "old" battery is a Varta 60V,there is the possibility that the new battery is a duff one,so I will refit the old one and see how I get on with the old battery/new alternator combo....The lad from the garage said the new alt. was fine............................................I will update to let folks know how I get on..Cheers.