(5) In the regulation check procedure, increase voltage to regulator and monitor both the voltmeter
and bulb.
(6) As the regulation point of a properly functioning control unit is approached, the bulb will blink
off and on. At regulation, the bulb will be ON continuously.
(7) If regulator does not regulate to 28 Volts, it is out of calibration, and must be replaced.
(8) If regulator checks good, check airplane for:
(a) Poor or loose connections.
(b) Poor ground on regulator housing.
(c) Shorted alternator windings.
(d) A grounded wire.
(9) After completing test, connect regulator into circuit
B. Overvoltage Relay Check
The Lamar regulator has an incorporated overvoltage relay. To check relay operation use the same
test connections as testing the regulator, except connect the bulb across the RED and BLUE wires.
(Refer to Figure 7.) Test as follows:
(1) While monitoring both the voltmeter and the light bulb, increase voltage to circuit slowly to 32 volts.
(2) After a slight delay, the bulb will light.
(3) If overvoltage control fails to operate at 32 Vdc, it must be replaced.
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