This does sound like a turn signal switch or wiring problem. The brake signal goes through the switch. You could unplug the harness and use a test light to check all input circuits ie brake in, hazard in and turn in. Depending on the flashers a test light may not draw enough current to get them to flash the test light.
Good call there, thanks. Lernt sumptin'
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!