3to 11hp 4-cycle l-head engines - Small Engine Suppliers

7 Amp Alternator System Regulator-
Rectifier Under Engine Block Housing
Models: H50-60, HH50-60, HM70-80-100,
HHM80, 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.
MAGNETO GROUND - GREEN
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. 28).
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.
D.C. OUTPUT LEAD-RED
28
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. 29)
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 must be defective.
10 Amp Alternator System - Regulator-
Rectifier-External to Engine
CAUTION: BLOWER
HOUSING MUST BE
INSTALLED WHEN
RUNNING ENGINE
B+ TERMINAL WIRE
INSERT PROBES INTO
CONNECTOR SLOTS
DO NOT REMOVE
CONNECTOR WIRES
YELLOW
RED
A.C. VOLTMETER
29
In this system, the regulator and rectifier are combined
in one solid state unit.
CHECKING THE SYSTEM: To check the system,
disconnect the D.C. or B+ wire at the switch end and
measure D.C. voltage between the lead and ground (diag.
30).
GREEN
YELLOW
REGULATOR/
RECTIFIER MUST BE
GROUNDED
30
With the engine running, minimum values should read:
2500 R.P.M. - 13.0 Volts D.C.
3000 R.P.M. - 16.0 Volts D.C.
3600 R.P.M. - 20.0 Volts D.C.
If the minimum values are noted, the system is okay.
Check for defective ammeter, wiring, etc. If less than the
above readings, disconnect the plug from the regulatorrectifier,
and insert the A.C. voltmeter probes in the two
outside terminals (diag. 31).
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