Was the voltage regulator tested?
Is the new battery bad? New Die Hard batteries have a fairly high dead
on arrival rate. Other brands may also.
One way to test is to measure the voltage with the engine running and
make sure it is between over 14 volts. Then take one strap off the
battery and measure any change in the open circuit voltage of the
battery at the beginning and end of a day or two period. If that tests
OK, then you have a drag on the battery, such as a light or fan or
short. You can track that down with an ohm meter and start removing
fuses. The fuse that removes the drag will lead you to the culprit. If
no fuse does, then it is in the headlight circuit. They normally aren't
on a fuse.
--
Cheers, Steve Henning in Reading, PA, USA
Owned '67,'68,'71,'74,'79,'81,'87,'93,'95 & '01 Volvos.
The '67,'74,'79,'87,'95 and '01 through European Delivery.
http://rhodyman.net/homevo.html