New Alternator not charging New Battery

[Carl Slater]

Astra 1.7tdci (56 estate) Help please--------replaced alternator and battery with new ----------carried out earthing test (earth strap from battery negative to engine)---alternator not charging battery----having to charge battery up on each journey and I take the old (turns out good ) battery with me to get home--------------PLEASE HELP

[Vauxhall Owners Club]

Hi Carl.....welcome to the Club

Have you tested the alternator for output...should be around/just over 14 volts.

If providing specified current/voltage then I would suggest that the battery is defective (albeit a new one).

Had this in the past where a customer went off to get their own battery and fitted it but not keeping a charge.

Told him to take it back as it was a cheap one and spend a bit more money on a premium battery.....you can tell the difference in the same size battery by the weight of it....cheap one is a lot lighter as not much lead inside. You get what you pay for sometimes!

Let us know what you find

[Carl Slater]

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.

[Vauxhall Owners Club]

Thanks for the update so far.....good luck with it

p.s. best check the battery terminals are clean and tight just to be sure its not that

[Carl Slater]

10 hours ago, Carl Slater said:

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.

Old battery performed better than new one;then same problem.maybe BOTH battery's are DUFF.Will update again once problem is (hopefully) sorted out!!

[Vauxhall Owners Club]

I can imagine the old one is a good quality battery but tired and the new one may be defective