Attached are diagrams for 2001 and 2002 headlamps. You confused me with the Imgur attached photos of yours - they are of the B fusebox under the hood and all headlamp fuses for a 2001 (according to the Volvo wiring diagram edition i have, sometimes there are errors) are in the C fusebox on the end of the dash. Note that headlamp fuses have been moved to the B fusebox under the hood on a 2002.
Also you used the word ballast - as in the transformer for an HID bulb - those are not shown in a 2001 or 2 wiring diagram. Are you saying you have HID bulbs? Or do you have H7 bulbs (with two melted by now spade connectors)?
Here's an example of a HID bulb wiring diagram from an 07 - the dash lines from the CEM to the headlamps is the wiring used for the ballasts.
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