Specifications

60
116
A.C. VOLTMETER
Yellow
Red
INSERT PROBES INTO
CONNECTOR SLOTS. DO
NOT REMOVE
CONNECTOR WIRES
CAUTION: BLOWER
HOUSING MUST BE
INSTALLED WHEN
RUNNING ENGINE
Check for a defective ammeter, wiring, etc. If less
than the above readings, disconnect the plug from the
regulator-rectifier, and insert the A.C. voltmeter probes
in the two outside terminals (diag. 114).
With the engine running the minimum values should
read:
2500 R.P.M. - 12.0 Volts A.C.
3000 R.P.M. - 14.0 Volts A.C.
3600 R.P.M. - 18.0 Volts A.C.
If the minimum readings are noted, the regulator-
rectifier is defective. If less than the above readings,
the alternator is defective.
7 Amp Alternator System Regulator-
Rectifier Under Engine Block Housing
Models: H50-60, HH50-60, HM70-80-100, HHM80,
LH318, LH358, TVM125-140-170-195-220
In this system, the regulator and rectifier are combined
in one solid state unit mounted under the blower housing
of the engine.
Various types of regulator-rectifiers have been used
on different applications. Test procedures for all types
are the same. However, regulator styles are not
interchangeable (diag. 115).
CHECKING THE SYSTEM: An open circuit D.C.
voltage check cannot be made with this system. If a
known good battery fails to maintain a charge, proceed
in making an A.C. voltage test.
To do this, the blower housing must be removed, and
the regulator-rectifier must be brought outside of the
blower housing.
Keep the A.C. leads attached to the regulator-rectifier.
Install the blower housing with the regulator-rectifier
outside the housing. With an A.C. voltmeter probe the
regulator as shown (diag. 116).
To avoid injury, at no time should the
engine be started with the blower
housing removed.
With engine running, minimum A.C. voltage from lead
to lead should be:
2500 R.P.M. - 16.0 Volts A.C.
3000 R.P.M. - 19.0 Volts A.C.
3300 R.P.M. - 21.0 Volts A.C.
3600 R.P.M. - 23.0 Volts A.C.
If the minimum readings are noted, the alternator is
okay. If the system fails to charge a known good battery,
the regulator-rectifier must be defective.
CAUTION
A.C.
114
115
D.C. OUTPUT LEAD-RED
MAGNETO GROUND - GREEN
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