A B767 BEING TAXIED FROM THE TERMINAL TO THE HANGAR HAD A RWY INCURSION. L SEAT TECHNICIAN BEING REQUALIFIED FOR TAXI OP AND CONFUSED BY UNLIGHTED TXWY SIGN.

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DURING A REQUALIFICATION TAXI OF ACFT X; I WAS IN THE L SEAT; AND THE LEAD TECHNICIAN WAS IN THE R SEAT; PER MY REQUEST. I HAD NOT TAXIED WITH HIM BEFORE; NOR HAD I TAXIED IN THE AREA OF TXWY S OR TXWY R. I DISCUSSED THIS WITH LEAD IN DETAIL; AND HE HAD ME PULL UP A COPY OF THE ZZZ ARPT; AND WE REVIEWED IT. HE POINTED OUT THE CONSTRUCTION AREAS AND I REVIEWED WHERE TXWY S AND TXWY R WERE ON THE MAP. WE RECEIVED OUR TAXI INSTRUCTIONS: TXWY A; TXWY B; TXWY K; HOLD SHORT RWY 28L; AND AS WE APCHED; WE WERE CLRED RWY 28L; AND HOLD RWY 28R. WE WERE CLRED RWY 28R TO TXWY R; TO TXWY C TO HANGAR FROM THE GATE. NOT REALIZING THE TURN ONTO TXWY R WAS A HARD R THEN AN ANGLED TURN; I MISSED THE TURN AND LEAD DIRECTED ME L TOWARD TXWY S. HE CALLED THE TWR TO EXPLAIN OUR NEW POS; AND THAT WE WERE ON TXWY S. ONE OF THE CONTRIBUTING FACTORS FOR NOT EXECUTING THE TURN CORRECTLY WAS THAT THE SIGN FOR TXWY R IS ON THE GND; AND IT DIRECTS YOU TO TXWY S'S DIRECTION; WHICH IS L. THE SIGN IS NOT MOUNTED; AND IS NOT ILLUMINATED. HOWEVER; IT WAS LIGHT OUT; WE DID NOT NEED ELECTRICAL ILLUMINATION; BUT AS A FIRST TIME TAXI TO THAT AREA; I COULD SEE THAT THE 'S' TAXI CONFIGN ONE WOULD NEED TO ACCOMPLISH REQUIRES A DESCRIPTIVE REVIEW PRIOR TO TAXIING THERE; AND MAYBE EVEN NOT A L SEAT POS; BUT ONE OF OBSERVATION TO BETTER IDENT THE AREA. WE WERE ON TXWY S; AND THE TWR TOLD US WE WERE ON AN ACTIVE TO CONTINUE TO TXWY R; TXWY C; HANGAR AND CALL BACK TWR ONCE POSITIONED. AS WE TAXIED ACROSS RWY 10L; I COULD SEE THE ACFT AT THE BEGINNING OF THE RWY JUST LAND AS WE TAXIED ONTO TXWY C. LEAD WAS IN COM WITH THE TWR DURING THE EXECUTION OF TAXI FROM TXWY S TO TXWY R; HOWEVER; ON ONE HAND; WHILE XING AN ACTIVE RWY WE WERE NOT DIRECTED TO HOLD OR STOP; WHEREAS WE SHOULD HAVE SAID TO THE TWR MORE CLRLY; 'THIS IS OUR POS; DO YOU WISH US TO GO BACK TO; OR CONTINUE ONTO; AND/OR STOP THE ACFT?' I AM VERY SORRY I MADE AN ERROR. IT WAS A SHARED MISTAKE; ONE OF COM AND INFREQUENCY OF TAXI; AND NOT HAVING THE SIGN MARKED CORRECTLY.