5 . A ground wire between the regulator GND terminal and the aircraft or test stand structure is essential
for proper operation. The alternator frame must also be solidly bonded to the system ground.
6. The alternator does not need to be polarized; NEVER CONNECT GROUND, even momentarily, to
either the regulator field terminal or to the alternator field terminals. Do not interchange I and F leads
to regulator; this will destroy the regulator.
7. The Lamar B-00288-1 regulator is intended for use with alternator systems having one field terminal
grounded at the alternator. The other field terminal, F2 of the alternator, is connected to the FIELD
terminal of the regulator. NEVER UNDER ANY CIRCUMSTANCE PERMIT A GROUND TO
CONTACT THIS CIRCUIT EVEN FOR AN INSTANT WHILE POWER IS APPLIED TO THE
SYSTEM. Do not use tools near these circuits while power is applied.
8. The alternator should be in good condition and capable of producing full output. The alternator drive
belt must be adjusted tight enough to prevent slippage.
9. The battery must be in good condition and fully charged.
10. Use only an accurate voltmeter and ammeter of the best quality.
11. A carbon-pile connected across the battery may be used to load the charging circuit while testing the
regulator.
TESTING LAMAR MODEL NO. B-00288-1 REGULATOR.
1. 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 24-5.
2. All circuit connections must 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.
3. The voltmeter will not indicate the true regulator setting until the regulator has been operating in the
c h a rging system or on the test bench for at least five minutes, at a charge rate of from 10 to 15
amperes.
Figure 24-5. Testing Lamar Model No. B-00288-1 Regulator
(S/N 44-7995001 thru 44-8195026 and all PA-44-180T’s)
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
24 -23-06
Page 24-18
Revised: June 20, 1995
1/2 W
2,200 OHM
PRECISION
V/M
BATTERY
CARBON
PILE
1
5 AMP
ALT
DC
AMMETER
PRESS — TO — TEST
NORMALLY OPEN
PAR FIELD
REGULATOR
UNDER TEST
GND BUS
2
1
V
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