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Try resetting the electrical system by locking and unlocking the doors with your key in the driver's door 5 times in a row. A service manager at a Volvo dealer showed me this after they did some work on my car and on the way home the sunroof wouldn't close.
I have a 2001 S80 that I have to reset the electrical system like this every time I disconnect the battery. All kinds of stuff stops working...sun roof, door locks, lights, radio, windows, etc. Just reset like described and everything should start working again.
the main terminal is a heavy red wire attached to the fuse block it should be clean and tight. also you can hook a test light from the battery neg. to the terminal it should light. if it doesn't light you could have a bad engine ground (primary ground). or a poor connection tot he main fuse block terminal previously mentioned
They can check the battery and the charging system for starters. Fully charged battery,clean cables. then do a load test on the battery. If it didn't pass the test replace it and check the charging system.
Charging system easy to check , Put voltmeter on battery terminals and monitor vehicle's voltage with and wthout accessories on. should be between 13.5 to 14.5v . Before condemning alternator inspect wiring behind alternator ...if corroded replace then retest.
If voltage is with range then the problem is in the power distribution compartment/ relay, or either is a ground all those items share.
It may be a circuit breaker.My windows and door locks stopped working,even after checking all fuses and replacing Main Driver side door switch! Found three circuit breakers that you can reset with a paper clip or small screwdriver. They were black with an aluminum cover on top. They don't come out easily,just insert the pin on each one.