Specifications

62
121
YELLOW
(A.C. LEAD)
GREEN
(MAGNETO SHUT-OFF)
YELLOW
(A.C. LEAD)
A.C.
Yellow
Yellow
Green
Red
GREEN
(MAGNETO SHUT-OFF)
RED
(D.C. WIRE)
RECT./REG.
16 Amp Alternator System with External
Regulator
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.
Disconnect the red D.C. output connector at the wire
harness and connect the probes from an A.C. voltmeter
to the wire terminals at the regulator-rectifier (diag.
120).
With the engine running the minimum values should
read:
2500 R.P.M. - 21.0 Volts A.C.
3000 R.P.M. - 26.5 Volts A.C.
3600 R.P.M. - 31.0 Volts A.C.
If the minimum values are noted, the alternator is
operating properly. If less than the above values are
noted, the alternator is defective.
20 Amp Alternator System
In this system, the regulator and rectifier are combined
in one solid state unit which is mounted into the blower
housing of the engine.
CHECKING THE SYSTEM: An open circuit D.C.
voltage check cannot be made. If a known good battery
fails to maintain a charge, proceed to make an A.C.
voltage test.
Disconnect the plug leading to the regulator-rectifier,
and insert the A.C. voltmeter probes into the two outside
terminals (diag. 121).
With the engine running the minimum values should
read:
2500 R.P.M. - 32.0 Volts A.C.
3000 R.P.M. - 38.0 Volts A.C.
3600 R.P.M. - 45.0 Volts A.C.
If the minimum readings are noted, alternator is okay.
If the system fails to charge a known good battery,
regulator-rectifier must be defective.
D.C. OUTPUT - RED
SOLENOID
Green
LIGHT
SWITCH
AMMETER
MAGNETO
GROUND
BATTERY
REGULATED
D.C. OUTPUT
FUSE
Yellow
Red
NOTE: D.C. OUTPUT MUST BE DISCONNECTED TO
PERFORM A.C. OUTPUT TEST.
120
www.mymowerparts.com
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983