Ammeter Shows Excess Current Over Entire Cycle; Ammeter Shows Normal Current Part Of Cycle/Excess Current Rest - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 3004. TROUBLESHOOTING (PROPELLER DEICER SYSTEM) (cont)
Trouble
Ammeter shows low current
over entire cycle.
(cont.)
Ammeter shows excess
current over entire cycle.
Ammeter shows normal
current part of cycle,
excess current rest
of cycle.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Ammeter faulty.
High resistance up to
timer.
Ammeter faulty.
Ground between ammeter
and timer.
Ground between timer
and brush block.
2E5
Remedy
Test for voltage up to
and out of ammeter. If
low output and input satisfactory,
replace ammeter.
If no voltage to ammeter,
locate and fix open between
switch and ammeter.
Check for partially broken
wire, loose or corroded
connection in wiring from
aircraft supply to timer
input.
Test for voltage up to
and out of ammeter. If
low output and input satisfactory,
replace ammeter.
If no voltage to ammeter,
locate and fix open between
switch and ammeter.
Disconnect harness at
timer and with ohmmeter
check from Pin B (of harness)
to ground. If ground
is indicated, locate and
correct.
Disconnect leads at
brush block and with
ohmmeter check from
power leads to ground.
If ground is indicated,
locate and correct.
Revised: May 15, 1989
3 0 - 6 2 - 0 0
Page 30-25