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Here's a link to the wiring chart - it's on page 20 of the linked pdf file at the bottom of the page.
http://volvo.techno.org.pl/wiring-diagrams.html
Wagon or sedan? The wagon has a separate bulb (1156)for the brake lights, the sedan uses a double filament bulb(1157)for the combo tail light/brake light.
You can find the grounding point by following the black wire out of the harness - one ground serves the entire side.
You can usually isolate the problem with a test light, a jumper wire and about ten minutes of circuit testing.
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