TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
(Sheet 2 of 2)
PROBLEM NO. 22 (CONT)
This circuit uses a normally closed pressure switch which opens when accumulator output pressure is about 1,100 psi (7585 kPa). If the pressure
drops to 1,000 100 psi (6900 69 kPa) the switch closes and the LOW PRESS BRAKE light comes orI as well as the operator warning horn. The
flasher causes the light to flash on and off.
TO TROUBLESHOOT: Disconnect W/O wire from brake pressure switch (do not allow it to touch ground). With engine running; if LOW PRESS
BRAKE light is now OFF, replace brake pressure switch, (see page 2-315). If light remains ON, W/0, 16 gage wire between
switch and lamp socket is shorted. See WIRE and HARNESS TESTING, page 2-66.
End
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