CHARGING SYSTEM
EEA -5
INSPECT CHARGING SYSTEM
VOLTAGE DROP TEST OF ALTERNATOR OUTPUT
WIRE
This test determines whether or not the wiring between the
alternator "B" terminal and the battery (+) terminal is good
by the voltage drop method.
PREPARATION
1.
Turn the ignition switch to "OFF".
2.
Disconnect the output wire from the alternator "B" ter-
minal. Connect the (+) lead wire of ammeter to the
"B" terminal of alternator and the (-) lead wire of am-
meter to the output wire. Connect the (+) lead wire of
voltmeter to the "B" terminal of alternator and the (-)
lead wire of voltmeter to the (+) terminal of battery.
Alternator
Ammeter
Voltmeter
Battery
TEST
1.
Start the engine.
2.
Turn on the headlamps and blower motor, and set the
engine speed until the ammeter indicates 20A.
And then, read the voltmeter at this time.
RESULT
1.
The voltmeter may indicate the standard value.
Standard value : 0.2V max
2.
If the value of the voltmeter is higher than expected
(above 0.2V max.), poor wiring is suspected. In this
case check the wiring from the alternator "B" terminal
to the battery (+) terminal. Check for loose connec-
tions, color change due to an over-heated harness,
etc. Correct them before testing again.
3.
Upon completion of the test, set the engine speed at
idle.
Turn off the headlamps, blower motor and the ignition
switch.