24-02-00
Page 24-03
December 1, 1978
1H22
CHART 2401. TROUBLESHOOTING (ALTERNATOR) (cont)
Zero output indicated on Open field winding in Disconnect field terminal of
ammeter regardless of RPM. alternator. alternator from field wiring
(Refer to alternator system and check for continuity from
test procedure.) (cont) field terminal to ground with
ohmmeter (20-100 ohms) de-
pending on brush contact re-
sistance. (Pull propeller
slowly by hand turning alter-
nator rotor through 360°
of travel.)
—CAUTION—
Turn magneto switch to off
before turning prop.
If resistance is high, check
brushes for spring tension
and excessive wear and re-
place if necessary. If brushes
are okay and field reads open,
replace alternator.
Output indicated on am- Faulty voltage regulator. Start engine, turn on load (re-
meter does not meet min- fer to alternator test pro-
imum values specified in al- cedure), set throttle at 2300
ternator system test pro- RPM. Check voltage at buss
cedure. bar (convenient check point,
remove cigar lighter and
check from center contact (+)
to ground (-). Voltage should
be 13.5-volts minimum. If
voltage is below this value,
replace regulator.
Trouble Cause Remedy
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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