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TM 5-4210-233-14&P-1
4-138. ENGINE SENDING UNITS - Continued
c.
Hour Meter Sending Unit.
(1) Testing.
(a) Disconnect wire from hour meter sending unit.
(b) Connect continuity checker between terminal on
sending unit and truck ground.
(c) Run main engine and check for continuity
through hour meter sending unit. If no continuity
is found, replace sending unit. (See para (2) below).
(d) If continuity is found at sending unit; check wiring
to hour meter and hour check meter. (See Wiring
Diagrams, Appendix H).
(2) Removal.
(a) Tag and disconnect wire (1) from hour meter
sending unit (2).
(b) Remove hour meter sending unit (2) from fitting (3).
(3) Installation.
(a) Install hour meter sending unit (2) on fitting (3).
(b) Connect wire (1) to hour meter sending unit (2).
d.
Follow-on Maintenance.
(1) Connect batteries (see para 4-114).
(2) Close engine compartment covers.
4-405
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