TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
34. LOW AIR PRESSURE WARNING BUZZER WILL NOT SHUT OFF AND PARKING BRAKE WARNING LIGHT
FLASHES WITH HAND/PARKING BRAKE IN ANY POSITION (AIR PRESSURE NORMAL)
Step 1. Set multimeter to RX1 for continuity reading.
Step 2. Disconnect lead 584 from parking brake switch (under cab).
Step 3. Check for continuity through parking brake switch to ground lead 584 (with parking
brake released).
Step 4. If continuity is not present, replace parking brake switch (para. 3-107).
END OF TESTING!
35. SPRING BRAKE WARNING LIGHT INOPERATIVE WITH SPRING BRAKE OVERRIDE ENGAGED
Test 1. Check spring brake override warning light.
Replace lamp with one known to be good (para. 3-84).
Test 2. Test spring brake pressure switch.
Step 1. Place battery switch to ON position.
Step 2. Disconnect two leads 37 from spring brake pressure switch.
Step 3. Connect a jumper wire to both leads 37. Warning light should operate.
If warning light is on, replace spring brake pressure switch (para. 3-100).
Test 3.
Test spring brake override warning light circuit breaker voltage.
Step
1. Place battery switch to OFF position.
Step
2. Disconnect lead 10 from circuit breaker.
Step
3. Place battery switch to ON position.
Step
4. Set multimeter to 50-volt range.
Step
5. Connect multimeter negative lead to vehicle chassis ground and positive lead to lead 10.
Multimeter should indicate battery voltage.
If battery voltage is not indicated, perform malfunctions 2, 3, 4, 6, and 7.
2-161
