RWY INCURSION BY A CRJ-2 PIC AFTER MISTAKING THE TXWY ENTRY POINT FOR RWY 8R DURING A NIGHT OP AT GRR; MI.

Narrative

AFTER PUSHBACK; WE WERE SIMPLY CLRED 'TAXI RWY 8R.' I REMEMBERED THERE ARE 2 PARALLEL TXWYS ALONGSIDE THE RWY; ONE LEADING ALL THE WAY TO THE APCH END; THE OTHER ENDING IN A 'T' ABOUT 1000 FT SHORT OF THE END. I CHKED THE ARPT DIAGRAM BUT MISREAD THE CHART AND TOOK THE WRONG TXWY. THINKING I HAD REACHED THE END OF THE RWY; I MADE A L TURN AT THE 'T.' HOLDING SHORT OF THE RWY; THE BEFORE TKOF CHKLIST WAS COMPLETED AND FO CALLED TWR; 'READY AT THE END' (NOT REALIZING MY TAXI ERROR EITHER). ATC CLRED US FOR TKOF; POINTING OUT A B727 ON A 6 MI FINAL SHOOTING A PRACTICE APCH. AS WE CROSSED THE HOLD LINE; HOWEVER; THINGS DID NOT LOOK RIGHT TO ME; AND MY FO SAID SOMETHING LIKE; 'THIS DOESN'T LOOK LIKE THE END; DOES IT?' REALIZING MY MISTAKE; I STOPPED THE ACFT PAST THE HOLD LINE BUT SHORT OF THE RWY EDGE AND STATED OUR POS TO ATC; OFFERING TO DO A TURN-AROUND ON THE RWY AND EXIT. TWR TOLD US TO HOLD OUR POS WHILE HE 'CLRED SOME TFC;' THEN PULLED THE B727 OFF THEIR APCH AND CLRED US TO BACK-TAXI INTO POS; FOLLOWED BY A TKOF CLRNC. FACTORS: 1) DARKNESS. 2) ARPT DIAGRAM IS SMALL SCALE; PACKING A LOT OF DETAILS INTO A SMALL PORTION OF THE PAGE. I THINK I ASSOCIATED THE WRONG LETTER ON THE CHART WITH THE WRONG TXWY. 3) COMPLACENCY: HAVE FLOWN INTO GRR MANY TIMES OVER THE YRS; BUT MAYBE NOT AS MUCH RECENTLY. 4) FO WAS NATURALLY BUSY WITH CHKLISTS; ETC; AND I FAILED TO SOLICIT HIS INPUT FOR A XCHK AT START OF TAXI; AS I OFTEN DO WITH LESS FAMILIAR ARPTS. IN THE FUTURE; I'LL MAKE MORE USE OF MY FO FOR HELP WITH TAXIING AT ALL ARPTS.