with the 2000XC do voltage drop testing on the cables under load., esp. the B+ cable from batt to fuse box. feel the pos cable after running car and see if it is hot(bad) where it goes down to the starter. what is batt. voltage and the voltage at batt with car running?
http://www.aa1car.com/library/voltage_drop_testing.htm
if you search "voltage drop" over at matthewsvolvosite.com you will read how checking volvo starting probs starts with a check of the cables at 2000rpm with lights on, fan on high and the rear defroster on.
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