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.-----+PAR
+
l/2W
2,200
OHM
11-22. TESTING REGULATOR.
PIPER SENECA II SERVICE MANUAL
L
PRESS - TO - TEST
I
NORMALLY OPEN
DC
I
AMMETER
Figure 11-11. Testing Regulator
CARBON
PILE
BATTERY
a.
The procedure for testing the regulator whether on the airplane or on the test bench remains the
same. Connect the test meters and regulator wiring as shown in Figure 11-11.
b.
All circuit connections should be clean and tight. This includes the test instrument connections
which must not come loose or open the charging circuit at any time while the system is operating.
c.
The voltmeter will not indicate the true regulator setting until the regulator has been operating in
the charging system or on the test bench for at least five minutes, at a charge rate of from IO to 15
amperes.
d.
With the connections made as shown in Figure l l-11, start the engine and adjust its speed to
approximately 920 to 1250
RPM
to obtain 3,000 to 4,000 alternator
RPM.
Turn on accessories as needed
to establish a 10 to 15 ampere load value. Note that the battery charge current is indicated by the ammeter.
Therefore, the current value may change downward at the beginning of a test run. This will be especially
true if the battery was used for engine starting.
e.
After one minute operating time, check the regulator operating voltage as indicated by the
voltmeter. Refer to Alternator Service Test Specifications, Paragraph 11-15 for the correct operating
voltage. The operating voltage is shown for the ambient temperature in which the regulator is operating.
f.
If the voltmeter reading indicates that the operating voltage is not within limits, lift the plastic
plug from top of regulator and adjust the voltage to the desired value. Replace the plug after adjustment.
Before condemning the regulator, recheck the alternator and the battery, making sure that they are in good
condition. Recheck all circuit connections and all wiring for unwanted resistance (voltage drop test).
Recheck the voltmeter for accuracy and repeat the entire operating test.
Reissued: 10/11/79
2G12
ELECTRICAL SYSTEM
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Do you have a question about the SENECA II and is the answer not in the manual?
Questions and answers
How to repair battery plane battery box
To repair the battery box on a Piper Seneca II, follow these steps:
1. Clean the Battery and Box – Remove corrosion by applying a baking soda and water solution mixed to a thin cream consistency. Continue applying until bubbling stops.
2. Rinse and Dry – Rinse thoroughly with clean water and dry completely.
3. Paint if Necessary – Apply acid-resistant paint to the battery box if needed and allow it to dry completely.
4. Place Drain Cap – Ensure the cap is placed over the battery box drain.
5. Reinstall the Battery – Once the box is prepared, reinstall the battery properly.
Caution: Avoid letting the soda solution enter the battery.
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