CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-7
NOTE: A clamp-type ammeter which enables
measurements to be taken without disconnecting
the generator output wire is recommended. If the
voltage may have dropped due to a bad connec-
tion at generator "B" terminal and the generator
"B" terminal is loosened when the test ammeter is
connected, the connection will be completed at
this time and the possibility of finding the problem
will be reduced.
5. Connect a digital-type voltmeter between the
generator "B" terminal and the positive battery
terminal. (Connect the positive lead of the
voltmeter to the "B" terminal, and then connect the
negative lead of the voltmeter to the positive
battery cable.)
6. Reconnect the negative battery cable.
7. Connect an engine tachometer or scan tool
MB991958.
8. Leave the hood open.
9. Start the engine.
10.With the engine running at 2,500 r/min, turn the
headlights and other lights on and off to adjust the
generator load so that the value displayed on the
ammeter is slightly above 30 A.
Limit value: maximum 0.3 V
NOTE: When the generator output is high and the
value displayed on the ammeter does not
decrease to 30 A, set the value to 40 A. Read the
value displayed on the voltmeter at this time.
In this case the limit value becomes maximum 0.4
V.
Adjust the engine speed by gradually decreasing
it until the value displayed on the ammeter is 30
A. Take a reading of the value displayed on the
voltmeter at this time.
11.If the value displayed on the voltmeter is above
the limit value, there is probably a malfunction in
the generator output wire. Check the wiring
between the generator "B" terminal and the
positive battery terminal (including fusible link).
If a terminal is not sufficiently tight or if the
harness has become discolored due to
overheating, repair and then test again.
12.After the test, run the engine at idle.
13.Turn off all lights and turn the ignition switch to the
"LOCK" (OFF) position.
NOTE: Vehicles for Canada, the headlight, tail-
light, etc. remain lit even when the lighting switch
is in "OFF" position.
14.Disconnect the engine tachometer or scan tool
MB991958.
15.Disconnect the negative battery cable.
16.Disconnect the ammeter and voltmeter and
engine tachometer.
17.Connect the generator output wire to the
generator "B" terminal.
18.Connect the negative battery cable.