DA90 CREW OVERSHOT THE TURN TO FINAL ON RWY 24R AT LAX.

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WE WERE CLRED FOR A VISUAL APCH TO RWY 24R AT LAX BY SOCAL APCH WHILE ON DOWNWIND AND JUST ABEAM ROMEN (FAF). THERE WAS AN EXPERIENCED CAPT IN THE R SIDE BUT UNFAMILIAR WITH FLYING FROM THAT SEAT. HE MISTOOK RWY 25R AS RWY 24R AND DELAYED HIS TURN TO FINAL UNTIL I TOOK CTL AND CORRECTED BACK TO RWY 24R. BOTH SOCAL AND TWR TOLD US WE WERE TOO FAR L OF CTRLINE AND TO CORRECT BACK. I ESTIMATE WE GOT 1.5 NM L OF RWY 24R CTRLINE AT 4 MI OUT. EVEN THOUGH THE LOC FOR RWY 24R WAS TUNED AND ARMED AND THE FMS MAP DISPLAY SHOWED THE CORRECT SITUATIONAL PICTURE; THE ACTING FO DIDN'T SEE THE CORRELATION AND FIXATED ON HIS VISUAL PICTURE. SINCE WE CAME IN FROM THE N AND MADE R TFC; MY VIEW WAS OBSTRUCTED BY THE AFTERNOON SUN AND THE ACFT ITSELF. WHEN WE DIDN'T MAKE THE TURN FROM BASE TO FINAL AT THE FMS'S COMPUTER LEAD; I TOOK CTL AND MADE THE CORRECTIONS BACK TO FINAL. I NEED TO BE READY TO MAKE THESE CORRECTIONS SOONER. MY ORAL INPUTS TO WHAT NEEDED TO BE DONE WERE NOT HEARD OR NEVER HEEDED. ANOTHER FACTOR IS SCHEDULING CREWS TOGETHER THAT HAVE A FO WITH LIMITED FAMILIARIZATION IN A PARTICULAR SEAT WHILE RUNNING SHUTTLES IN A HVY WORKLOAD ENVIRONMENT. IT'S A HUGE BURDEN ON THE OTHER CREW MEMBER. THIS WILL BE DISCUSSED AT OUR NEXT MGR'S MEETING.