Specifications

57
Yellow
Red
DIODE
A.C.
110
108
Yellow
Red
DIODE
A.C.
DIODE
Red
D.C.
109
Yellow
Models OVM/OVXL/OHV
(Read between Engine and Diode, diag. 108 and
109)
With the engine running the minimum values should
read:
2500 R.P.M. - 20.0 Volts A.C.
3000 R.P.M. - 25.0 Volts A.C.
3300 R.P.M. - 26.5 Volts A.C.
3600 R.P.M. - 29.0 Volts A.C.
Models OHV13.5-17.0
(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.
3 Amp D.C. 5 Amp A.C. Alternator
Models: H & HSK 50-60, HH50-60, HM & HMSK 70-
80-90-100, LH318, LH358, TVM125-140-170-195-220,
TVXL195-220
This unit combines a 3 Amp D.C. system used to charge
a battery and 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.
CHECKING THE SYSTEM: To check the system,
disconnect the plug and measure the D.C. voltage at the
red wire terminal (diag. 109). Measure the A.C. voltage
at the yellow wire terminal. With the engine running the
minimum values should be:
3 Amp D.C.
2500 R.P.M. - 8.0 Volts D.C.
3000 R.P.M. - 11.0 Volts D.C.
3600 R.P.M. - 13.0 Volts D.C.
5 Amp A.C.
2500 R.P.M. - 8.0 Volts A.C.
3000 R.P.M. - 11.0 Volts A.C.
3600 R.P.M. - 13.0 Volts A.C.
If the above minimum values are noted, system is okay.
Check for defective lights, wiring or switches. If less
than above values are noted, pull back the protective
shrink tubing from the diode. Using an A.C. voltmeter,
check the voltage between the alternator and diode as
shown (diag.110).
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