5-5
CHECKING THE SYSTEM: To check the system,
disconnect the plug and measure the D.C. voltage at the
red wire terminal. Measure the A.C. voltage at the yellow
wire terminal. With the engine running, the minimum
values should be:
CAUTION: Follow all Safety precautions when
testing for A.C. Voltage, electrical shock can kill.
3 Amp D. C. (Red wire)
6.5 Volts D.C - 2500 R.P.M.
9.0 Volts D.C - 3000 R.P.M.
11.0 Volts D.C. – 3600 R.P.M.
5 Amp A.C. (Yellow wire)
15.0 Volts A.C. – 2500 R.P.M.
18.0 Volts A.C. – 3000 R.P.M.
22.0 Volts A.C. – 3600 R.P.M.
If the above minimum values are noted, the 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 going into the diode from alternator, at
the lead on the alternator side of the diode. (Illust. 5-7) If
low or no voltage is experienced, replace the alternator.
16 AMP ALTERNATOR SYSTEM WITH
EXTERNAL REGULATOR
CAUTION: FOLLOW ALL SAFETY PRE-
CAUTIONS WHEN TESTING FOR A.C.
VOLTAGE, ELECTRICAL SHOCK CAN KILL.
CHECKING THE SYSTEM: 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.
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.
With the engine running, minimum values should read:
21.0 Volts A.C. – 2500 R.P.M.
26.5 Volts A.C. – 3000 R.P.M.
31.0 Volts A.C. – 3600 R.P.M.
If the minimum values are noted, the alternator is
operating properly. If less than the above values are
noted, the alternator is defective.
5-7
DIODE
RED
YELLOW
A.C.
(Read between Engine and Diode)
17.0 Volts A.C. – 2500 R.P.M.
21.0 Volts A.C. – 3000 R.P.M.
24.5 Volts A.C. – 3600 R.P.M.
If low or no voltage is experienced, replace the alternator.
If the alternator puts out the minimum A.C. voltage,
replace the diode.
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