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AMPS TEST
(ALTERNATOR OUTPUT)
REVERSE
CONNECTIONS
IF METER READS BACKWARDS
OUTPUT
on the alternator. Reconnect the Negative cable
to the battery.
4.
Turn off all lights and accessories. Start the
engine and rev it to about 2000 RPM.
If
the read-
ing observed on the 0-160 AMP scale corresponds
to the alternator output specified in the vehicle
service manual, the alternator is O.K. and the
trouble, if any, is in the regulator.
5.
=-If
the outptJt j.s-be low-ra-t-ifl , cheek fer I-eese
fan belt, defect in the alternator windings or
diodes or higher than normal resistance in the
cables or connections in the charging circuit.
6.
As a safety precaution, remove the battery
Negative cable before you remove the shunt.
Attach the alternator output cable to the output
terminal and then re-connect the battery Nega-
tive cable.
The alternator output should be checked if the vo;tage reading was below 13.2 in the CHARGING
SYSTEM TEST on page 5, or if the battery requires frequent charging with a portable charger.
Set the slide switch knob to AMPS. The Function Selector Knob can be at any position. Observe
the test reading on the 0-160 AMPS scale.
1. Consult the vehicle service manual for the
correct method of disconnecting the regulator in
order to check the alternator output without the
regulator in the circuit. When the regulator is
disconnected, the circuit must be bypassed in
order to observe alternator output. Consult the
vehicle service manual for correct method of
bypassing the regulator circuit.
2. Remove the Negative cable connection on the
-.battery
is wi II-e Ii mi nate-t-he danger of-shoF-t-i-Ag
the battery with the too I used to perform Step 3.
3. Consult the service manual for the vehicle
being tested for the location of the alternator
output terminal and remove the cable from the
output terminal.
Connect the shunt between
the cable and terminal as shown.
Be
sure these
connections are tight.
The slotted side of the
shunt should be connected to the Positive terminal
POINTS- LOW VOLTAGE SCALE
The POINTS scale is also a 0-1.0 volt scale.
This scale is useful for checking voltage drops
in the vehicle's electrical system.
POINTS
NOTE: USE GREEN AND BLACK
CLIPS· FOR THIS TEST
POINTS
Set the slide switch knob to OTHER TESTS and
the Function Se lector Knob to POI NTS.
Use
the GREEN and BLACK clips for these tests.
The RED clip is not used.
Corroded or loose connections and frayed or bro-
ken cables can cause excessive voltage drops in
the starting circuit which can cause hard starting.
To test for these conditions, connect the clips be-
tween 1 and 2, 2 and 3, 4 and 5, 5 and 6, 6 and
7, 7 and 8 with the starter turning. During this
test, no reading should be higher than .1 volt.
If a reading higher than. 1 volt is observed during
any of these tests, check the cable or connections
involved, clean and tighten the connections and
replace the cables or solenoid when necessary. If
the meter reads to the right of zero during any of
the above tests, reverse the position of the clips.
6
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