Tecumseh Quick Reference - Small Engine Discount

10 Amp A.C. Alternator
CHECKING THE SYSTEM: Unplug the connector
at the wiring harness supplied by the OEM. Proceed
to make an A.C. output check. Place one lead of the
A.C. voltmeter into the center of the connector.
Place the other lead to engine ground (diag. 90).
With the engine running the minimum values should
A.C. OUTPUT
read:
YELLOW
A.C.
2500 R.P.M. - 16.0 Volts A.C.
3000 R.P.M. - 20.0 Volts A.C.
3300 R.P.M. - 22.0 Volts A.C.
If less than above output, the alternator assembly is
defective. 90
10 Amp Alternator System - Regulator - Rectifier-External to Engine
In this system, the regulator and rectifier are
combined in one solid state unit.
D.C. VOLTMETER
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. 91).
B + TERMINAL WIRE
With the engine running the 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 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. 92).
REGULATOR/RECTIFIER
MUST BE GROUNDED
A.C.
91
With the engine running the minimum values should
read:
2500 R.P.M. - 16.0 Volts A.C.
3000 R.P.M. - 19.0 Volts A.C.
3600 R.P.M. - 24.0 Volts A.C.
If the minimum readings are noted, the alternator is
okay.
92
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