Thanks guys; both of your posts give me something new to look for. For what it's worth, I tried to follow the leads from the tail lights back into the bike. I removed some of the plastic panels to get better access, but it's still really difficult to follow the individual wires as they go in and out of the wiring harness. I didn't find any loose, broken or corroded wires or connectors. I was concerned about the turn signals because they come off the same power source from the fuse box as the brake lights, but the turn signals work fine. I couldn't find a wiring diagram for the V-strom, but I found one for the SV 650, and there is nothing unique there that can explain this. When I had the bulbs out, I hooked them directly to a battery and they worked; both filaments lit when I hooked them up. The bike has not been wrecked or fiddled with, so I don't think anyone has boogered up the wiring. When all else fails, I'll bypass the wiring harness altogether and hook up brake lights on a seperate circuit.
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