What was found
(CAN) PILOT REPORTED NO MASTER WARNING OR CAUTION LIGHTS WORKING ON A/C.THE SYSTEM SENDS POWER TO LIGHTS FROM CENTRAL ADVISORY & WARNING CONTROL UNIT & PLACES GROUND TO TURN LIGHTS ON. 14.62 VOLTS MEASURED FROM UNIT. AFTER CONSULTING WITH TECHNICAL REPRESENTATIVE FOR MANUFACTURER A NEW CONTROL UNIT ORDERED. AFTER IT INST LIGHTS FAILED TO WORK. WIRES FROM TB115-02 WERE REMOVED VOLTAGE WAS TESTED AGAIN & WHEN WIRES WERE INSTALLED THE SYS WORKED NORMAL. THE A/C DEPARTED ON FLT TO ANOTHER BASE SYS FAILED AGAIN AT BASE. BASE ENGINEER WAS INSTRUCTED TO REMOVE WIRES GOING OUT OF TB115-02 TO SEE IF PROBLEM WITH ONE OF 4 LIGHTS HOOKED UP TO IT.