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SERVICE BULLETIN
DATE:
4/28/76
BULLETIN NUMBER: 92
MODEL:
All
SUBJEC~
Troubleshooting water Temperature and Oil Pressure Gauges
Given a presumably faulty gauge indication with the instrument panel
energized, the first step is to check for 12 VDC between the ign. (B+)
and neg. (B-) terminals of the gauge.
--
Assuming there are 12 volts as required, leave the instrument panel
energized and perform the following steps:
1.
Disconnect the sender wire at the gauge and see if the gauge
reads zero, the normal reading for this situation.
2.
Connect the sender terminal at the gauge to ground and see if
the gauge
reads
full
scale,
the normal
reading
for
this
situation.
If both of the above gauge tests are positive, the gauge is undoub-
tedly OK and the problem lies either with the conductor from the
sender to the gauge or with the sender.
If either of the above gauge tests is negative, the gauge is probably
defective and should be replaced.
Assuming the gauge is OK, proceed as follows.
Check the conductor
from the sender 'to the sender terminal at the gauge for continuity.
Check that the engine block is connected to ground.
Some starters
have isolated ground terminals and if the battery is connected to the
starter (both plus and minus), the ground side will not necessarily be
connected to the block.
If the
sender
to gauge conductor
is OK and
the engine block
is
grounded, the sender is probably defective and should be replaced.
106
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