You can check the new alternator is charging the battery properly with your multimeter......
Check that battery terminals are tight and there is no white deposits at the terminals(or minimal corrosion at least)
A good battery at rest, that has been well charged and is holding charge should be around 12.6 V, even the next day.....
An alternator that is charging properly should be putting around 14 V into the battery at around 1200 - 1400 revs.
If the alternator is charging properly, but the battery is not holding charge, then the battery is most likely stuffed...
If the terminals are loose/corroded this can be preventing proper voltage transfer, either charging or starting so make sure these are ok first
Mic
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