TD80™ Level Gauging and Overfill Prevention System Product Manual
Page 74 TD80 and Overfill Prevention System Troubleshooting/ Rev. 2, August 4, 2015
2. Finch Display shows “OFF” when the PTO is engaged or Gauge Enable is
on.
Manually enable
the PTO signal
with the Gauge
Enable switch on
the Finch 5332E
Display if it is
available. If the
system activates,
then check for an
open circuit in
the PTO signal
as follows:
i. Clip the test light to
ground and probe tip to
the PTO signal at all
points in the circuit. The
test light will complete a
path to ground and
activate the PTO signal.
Probe all points from
the 5332(E) PTO signal
input back to the
source. This will isolate
a broken wire or
defective switch.
Inspect for broken or corroded wiring where
the test light fails to activate the PTO signal
and repair as necessary
ii. An alternative method
is to clip the test light to
battery power and
confirm the PTO signal
is grounded at all circuit
points until the light
does not illuminate. This
will isolate the wire
break or defective
switch.
a. Inspect for broken or corroded wiring
where the test light fails to illuminate and
repair as necessary
b. If the Gauge Enable
switch or PTO signal
ground at the 5332(E)
does not activate the
system, then the
5332(E) PTO signal
input is defective.
Finch Display is
faulty, replace
the unit
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