IAI-1125 LNDG IND MADE INCORRECT TURN WHILE EXPERIENCING 4 RWY ASSIGNMENT CHANGES.

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DURING APCH TO IND; I WAS ASSIGNED RWY 14 AND BEING GIVEN VECTORS. I WAS AT 8000 FT MSL AND ABOUT 25 MI NW OF IND. THE RWY WAS CHANGED TO RWY 5L. MY COPLT ASKED IF WE COULD KEEP OUR CLRNC TO RWY 14; SINCE WE HAD ALL NAV SET UP FOR THE ILS RWY 14 AND IT WOULD HAVE BEEN A SHORTER TAXI TO THE GA RAMP. OUR REQUEST WAS DENIED; AND WE WERE TOLD TO EXPECT RWY 5L. MY COPLT THEN PUT AWAY ALL CHARTS FOR RWY 14; PULLED OUT THE CHARTS FOR RWY 5L; AND SET UP THE NAVS FOR THE NEW APCH. WE WERE GIVEN A SOUTHERLY HDG. THEN WE WRE ASKED IF WE STILL WANTED TO USE RWY 14. WE SAID YES; SINCE WE WERE STILL ABOUT 20 MI OUT. WE WERE ASSIGNED HDG 180 DEGS; THEN GIVEN A HDG OF 140 DEGS AND TOLD TO DSND TO 7000 FT. MY COPLT READ BACK THE 140 DEG HDG AND 7000 FT. HE THEN BEGAN TO GET THE CHART FOR THE ILS RWY 14 OUT OF THE BINDER AGAIN. I HAD HEARD A HDG OF 040 DEGS AND BEGAN A L TURN WHILE DSNDING TO 7000 FT. I WAS WONDERING WHY THE NEAR 90 DEG BASE TURN OT RWY 14 SO CLOSE TO THE FINAL APCH COURSE. WE WERE ABOUT TEN DEGS FROM INTERCEPTING THE FINAL APCH COURSE. I WAS WATCHING AN ACFT THAT WAS LOWER THAN US AT MY 9 O'CLOCK POS ON A SBOUND HDG. I REMEMBER THINKING THAT HE NEEDED TO BE DSNDING OR TURNING TO THE SW IF HE WAS TO LAND ON RWY 5L/R; AND THAT IF HE DID NOT BEGIN A DSCNT OR TURN SOON; WE WOULD COME VERY CLOSE TO EACH OTHER. WHEN I LOOKED AT OUR TCASII; I NOTICED THE ACFT WAS ON THE EDGE OF THE 3 MI RING AND 500 FT BELOW US. COMING THROUGH A HDG OF 070 DEGS; THE CTLR ASKED MY HDG; AND SAID WE HAD TURNED TOO FAR. HE THEN ASSIGNED THE OTHER ACFT; A TWIN TURBOPROP COMMUTER ACFT; TO CLB TO 8000 FT AND GAVE US A HDG OF 180 DEGS AND 8000 FT. THE CTLR SAID WE HAD TAKEN ANOTHER ACFT'S CLRNC. I WAS SURE WE HAD NOT. MY COPLT TOLD THE CTLR THAT WE HAD THE OTHER ACFT ON TCASII. I'M NOT SURE IF HE SAID WE HAD A VISUAL WITH THE OTHER ACFT ALTHOUGH I HAD BEEN WATCHING THE OTHER PLANE FROM ABOUT THE TIME I CAME THROUGH A HDG OF 145 DEGS. I WAS WONDERING WHY THE CTLR HAD GIVEN THE OTHER ACFT A CLB TO 8000 FT WHEN WE WERE ABOVE THEM AND THEN GAVE ME A R TURN TO A HDG THAT WOULD PARALLEL THE 2 OF US AND/OR PLACE US ON AN INTERCEPT. I HADN'T EVEN MADE IT TO 7700 FT BEFORE BEING ASSIGNED 7000 FT AGAIN; GIVEN A 230 DEG HDG; AND REASSIGNED RWY 5L AGAIN. THIS WAS THE FOURTH RWY CHANGE. AFTER ALL THIS; THE REST OF THE APCH WENT SMOOTHLY.