TM 9-2350-247-20-1
SERVICE STOPLIGHT DOES NOT WORK—Continued
0042 00
2Y
1. Install bulbs in stoplight-taillight (WP 0278 00).
2. Disconnect circuit 75 lead (1) and circuit 75A lead (2) from
stoplight switch (3).
3. Measure resistance between circuits 75 and 75A on stoplight
switch. Multimeter should read infinity.
4. Depress switch arm and measure resistance. Multimeter should
read continuity.
5. Are readings correct?
YES
NO
2YN
1. Replace faulty stoplight switch
(WP 0274 00).
2. Verify no faults found.
3Y
1. Connect circuit 75 and 75A leads to stoplight switch.
2. Remove circuit 22 plug (1) from left taillight or circuit 23 plug
(2) from right taillight.
3. Turn main light selector switch lever on light switch to STOP
LIGHT.
4. Measure voltage between circuit 22 (left) plug (1) or circuit 23
(right) plug (2) and ground with brakes applied (on M548A1 both
right and left steering levers locked in park position).
5. Does multimeter read less than 17 volts?
YES
NO
3YN
1. Install circuit 22 and 23 plugs on left
and right taillights.
2. Replace service or blackout stoplight
bulb (WP 0278 00).
3. Verify no faults found.
0042 00-2
