TM 10-3930-641-20
ELECTRICAL SYSTEMS TROUBLESHOOTING (CONT)
(Sheet 1 of 3)
PROBLEM NO. 28
DO NOT WORK
GAGES
Engine running and at nomal operating temperature.
The gages receive power from fuse 9 (rightmost fuse in RHIP). If all the gages do not work, check fuse 9 first. If fuse is good, repair/replace Y/BR
In case of suspected pressure or temperature gage malfunction, test circuit as follows: Remove wire from corresponding sender, with the POWER
switch ON, and note the gage reading. Then momentarily ground the wire to machine frame and note gage reading. If gage and associated wiring are
good, results should be:
Gage Indication With
Gage Indication With
Wire Grounded
Wire Disconnected
Gage
High
Low
Engine Coolant Temp.
High
Low
Converter Temp.
Low
High
Engine Oil Pressure
Low
High
Engine Fuel Pressure
Senders are probably more likely to fail than the gages themselves.
Go on to Sheet 2