CAPT OF AN ACR ATTEMPTED TO INTERCEPT THE WRONG LOC COURSE. DUE TO NOT REPROGRAMMING THE FMS TO THE NEWLY ASSIGNED LOC THE ACFT TRIED TO INTERCEPT LOC FOR RWY 26R VERSUS RWY 27L. APCH CTLR INTERVENED AND GAVE ANOTHER HEADING TO INTERCEPT THE NEW RWY LOC ASSIGNMENT.

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TALKING TO FINAL CTLR; HE TOLD US TO EXPECT RWY 26R; I WAS AT 250 KTS DSNDING FROM 10000 FT TO 6000 FT; TOLD TO TURN TO HDG 220 DEGS AND SLOW TO 210 KTS. WE WERE 2-3 MI FROM FINAL APCH COURSE. WHEN WE WERE TOLD WE WERE GOING TO RWY 27L; DSND TO 2800 FT; THE FO STARTED TO SET UP FMS FOR ME TO VERIFY AND PUT THE LOC ON HIS SIDE. I PUT THE LOC COURSE ON MY SIDE BUT DID NOT BRING THE FREQ OVER ON MY PANEL AND PROGRAM THE FLT DIRECTOR TO CAPTURE THE LOC. THE AUTOPLT TRIED TO CAPTURE RWY 26R LOC. AT THE SPD WE WERE GOING THE ACFT WENT THROUGH THE LOC SO THAT IT WAS R OF COURSE. THE CTLR SAW THIS AND MADE IT PLAIN THAT WE WERE TRYING TO CAPTURE THE WRONG LOC AND TO TURN MORE L FOR RWY 27L. IF WE DID NOT SEE THE ACFT FOR RWY 26R WE WOULD HAVE TO STOP DSCNT. WE SAW THE ACFT. NO CONFLICT. INTERCEPTED LOC RWY 27L; LNDG WITH NO PROBS. THIS WAS THE LAST DAY OF A 5 DAY LINE. 1ST DAY 14 HRS; WITH AN 8 HR OVERNIGHT. 8 HRS NEXT DAY. DAY 3; XA30 SHOW FOR AN 11 HR DAY WITH A LOT OF WX; TURNED INTO A 13 HR DAY. 4TH DAY; 9 HRS WITH A 9 HR 30 MIN OVERNIGHT. THIS WAS 5TH DAY; 2 HRS 20 MIN FLT -- 770 MI. WE WERE GIVEN DIFFERENT RWY; WHEN CLOSE IN; WHEN THE WORKLOAD WAS VERY HIGH AND A SIMPLE MISTAKE OF NOT HITTING MY SIDE HARD ENOUGH OR FORGETTING TO BRING IT OVER TO THE ACTIVE SIDE. WE ARE TRAINED TO 'IDENT' EVERYTHING; BUT DID NOT GET A CHANCE TO DO ALL THREE BEFORE WE WENT THROUGH RWY 26R LOC.