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It is important, before altering the regulator setting, when the battery is in a low state of charge, to
check that its condition is not due to a battery defect or to the dynamo belt slipping.
How to check and adjust electrical setting
The regulator setting can be checked without removing the cover of the control box.
Withdraw the cables from the terminals marked 'A' and 'Al' at the control box and join them together.
Connect the negative lead of a moving-coil voltmeter (0-20 volts full-scale reading) to the 'D' terminal
on the dynamo and connect the other lead from the meter to a convenient chassis earth.
Slowly increase the speed of the engine until the voltmeter needle flicks and then steadies; this should
occur at a voltmeter reading between the limits given below for the appropriate temperature of the
regulator.
Setting at 10° C. (50°F)
Setting at 20° C. (68°F)
Setting at 30° C. (86°F)
Setting at 40° C. (104°F)
If the voltage at which the reading becomes steady occurs outside these limits, the regulator must be
adjusted.
Shut off the engine, remove the control box cover, release the locknut (A) (Fig. N.8) holding the
adjusting screw (B) and turn the screw in a clockwise direction to raise the setting or in an anti-
clockwise direction to lower the setting. Turn the adjusting screw a fraction of a turn and then tighten
the locknut.
When the dynamo is run at a high speed on open circuit, it builds up a high voltage. When adjusting
the regulator, do not run the engine up to more than 3,000 RPM. or a false voltmeter reading will be
obtained.
Fig. N.7 Mechanical regulator adjustment
202
16.1 -16.7 Volts
15.8 - 16.4 Volts
15.6 – 16.2 Volts
15.3 – 15.9 Volts
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