Testing Electric Type Indicator

1. Disconnect wire at engine sending unit. Ground wire to
engine block. If gauge registers when ignition is turned
on, you may have a bad sending unit, test as follows.

2. Connect a test light consisting of a 12 volt, 2 candlepower
bulb, & a pair of test leads in circuit by clipping one lead
to battery positive termainal & other lead to body of engine
sending unit. If bulb lights, uint is properly grounded. If
bulb dose not light, check for presence of sealing compound
around threads ot unit. Remove compound & repeat test. Make
sure unit is properly ground before proceeding with next test.

3. Remove test lead from body of sending uint & connect lead to
termanal of unit. If bulb lights, engine sending unit is
internally short-circuited & should be replaced.

4. Remove test light & reinstall wire on Sending Unit.

5. If engine sending unit test satisfactory under the above
conditions, check the following items according to nature
of difficulty.

A. If gauge dose not register when ignition is turned on:
This may be caused by a break in the circuit between the
gauge & the ignition switch or a short between this lead
& ground.

B. If gauge shows high temperature under all conditions; wire
leading from gauge & engine sending unit is shorted
to ground.

C. If gauge registers a low temperature under all conditions,
wire between gauge & sending unit is broken.