TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
10. NO TRANSIT LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY)
(continued).
VOLTAGE TEST
CAUTION
Use care when removing relay from
circuit board. Failure to comply
with this caution may result in dam-
age to the circuit board.
(1) Remove relay K3 from cab control box
circuit board.
(2) Turn engine start switch to ON
position.
(3) Turn light control switch to STOP
LIGHT position.
(4) Set multimeter to voltage position.
(5) Place positive (+) probe of multimeter
on relay K3 socket, position 86.
(6) Place negative (-) probe of multimeter
on known good ground, and check
multimeter for voltage reading.
(7) Turn engine start switch and light
control switch to OFF position.
RELAY K3
SOCKET
4-179
Change 1
