45
INSERT PROBES INTO
CONNECTOR SLOTS DO
NOT REMOVE
CONNECTOR WIRES
A.C. VOLTMETER
YELLOW
CAUTION: BLOWER
HOUSING MUST BE
INSTALLED WHEN
RUNNING ENGINE
MAGNETO GROUND - GREEN
D.C. OUTPUT LEAD-RED
21
Models OHV 13.5 - 17
(Read between Engine and Diode)
2500 R.P.M. - 17.0 Volts A.C.
3000 R.P.M. - 21.0 Volts A.C.
3600 R.P.M. - 24.5 Volts A.C.
If low or no voltage is experienced, replace the
alternator. If the alternator puts out the minimum A.C.
voltage, replace the diode.
RED
7 Amp D.C. Alternator System Regulator-
Rectifier Under Engine Housing
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. 20).
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 to make 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. 21)
CAUTION: 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 is defective.
19
20
YELLOW
RED
DIODE
A.C.
