Tecumseh ECV100-120 - TECHNICIAN S Handbook page 57

5 Amp Alternator System Regulator-Rectifier
Under Blower Housing
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.
Disconnect the red D.C. output connector at the wiring
harness and connect the probes from an A.C. voltmeter
to the wire terminals at the regulator-rectifier (diag. 23).
CAUTION: AT NO TIME SHOULD THE ENGINE
BE STARTED WITH THE BLOWER HOUSING
REMOVED.
With the engine running, the minimum values should read:
2500 R.P.M. - 19.0 Volts A.C.
3000 R.P.M. - 23.0 Volts A.C.
3300 R.P.M. - 26.0 Volts A.C.
3600 R.P.M. - 28.0 Volts A.C.
If the minimum values are noted, the alternator is okay; the regulator-rectifier is defective. If less than above readings,
the alternator is defective. See Chapter 9 for "Disassembly Procedure".
3 Amp D.C. 5 Amp A.C. Alternator
Models: H & HSK 50-60, HH50-60, HM & HMSK 70-80-90-100, TVM125-140-170-195-220,
TVXL195-220
This unit combines a 3 Amp D.C. system used to charge
a battery with a 5 Amp A.C. system used for lighting.
Located in the red wire of the harness is a diode which
converts the alternating current to direct current for
charging the battery. The yellow wire provides the A.C.
voltage for the lighting circuit.
CAUTION: BLOWER HOUSING MUST BE
INSTALLED WHEN RUNNING ENGINE
(continued on top of next page)
INSERT PROBES INTO
CONNECTOR SLOTS.
DO NOT REMOVE
CONNECTOR WIRES.
A.C. VOLTMETER
D.C.
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