(a) With engine stopped, disconnect the two
leads from the oil pressure switch.
(b) Attach a continuity tester to the two
terminals on the switch. Have an assistant turn over the
engine several times. As oil pressure builds and exceeds
13 psi, the switch will close.
there should be no continuity reading. As the switch
closes, a continuity reading can be observed on the tester.
If no reading is obtained, the switch is defective and must
(3) Apply a thin layer of pipe compound (item 26,
securely. Reconnect the two leads to switch.
(4) Replace engine shroud cover.
Battery and Cables
When troubleshooting an electrical malfunc-
tion or performing electrical maintenance,
ALWAYS disconnect Intervehicular electrical
cable from semitrailer, and negative battery
cables at batteries. Failure to follow this warn-
ing may create a spark and explosion, result-
ing in serious injury or death to personnel.
(a) With an external 12V source connected
to solenoid switch terminal, check operation of plunger
Refer to FM 9-207, Operation and
and current draw.
Maintenance of Ordnance Material in Cold
Weather (0 to -65 `F) for Information on
(b) Current draw with the plunger up
maintenance of batteries In extreme cold.
should be about 1 amp. If it is much more, the contacts did
not close and solenoid should be replaced.
Replacement of Low Oil Pressure Switch.
securing battery cover to battery holddown assemblies.
(1) Remove engine shroud cover.
(2) Disconnect negative, then positive battery
switch. Unscrew the low oil pressure switch.
cables from terminals.