Piper Navajo PA-31 Service Manual page 738

B294
O/V
Figure 11-36. Adjusting Regulator (Lamar)
b. Lift the wire from the "PAR" terminal of either regulator and insulate the free end
so it will not contact other circuits or ground during the adjustment procedure. Breaking
this circuit disables the balancing circuits in both regulators.
c. Turn off the "LEFT" alternator field switch. All the "RIGHT" alternator switches
are to be on.
d. Operate the "RIGHT" engine and alternator system with a load of 15 to 30
amperes, and an engine RPM of 1500 for at least five minutes. If required, carefully set the
"RIGHT" regulator voltage adjustment to the correct voltage value as measured with the
precision voltmeter connected to the regulator terminals. Replace the snap plug in the
"RIGHT" regulator adjustment access hole.
CAUTION
Do not make any further adjustment of the "RIGHT"
regulator.
NOTE
PIPER NAVAJO SERVICE MANUAL
PRECISION V/M
(INITIAL SETTING
D. C. BUS
FOR ADJUSTMENT
DISCONNECT
PAR LEADS
REGULATOR
^
PAR
SUGGESTED METER
SIMPSON #260 OR EQUV
RANGE 0-50V & 0-5V DC
(FINAL ADJUSTMENT POSITION)
NOTE:
THIS DIAGRAM SHOWS ONLY BASIC
CONNECTIONS FOR THE PURPOSE OF
EXPLAINING ADJUSTMENT PROCEDURE.
CAUTION:
FIELD V/M CIRCUIT MUST
NEVER TOUCH GROUND
Several operations of connecting and disconnecting the
"PAR" circuit wire are required by the following steps. For
convenience, a switch or a dependable clip connection may
be used to accomplish this. No danger of damage exists if this
circuit touches any other circuit or ground; however,
erroneous results will be obtained if such occurs.
Revised: 3/14/83
ELECTRICAL SYSTEM
4C12