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SECTION 55 -- ELECTRICAL SYSTEM -- CHAPTER 4
603.54.471.00 -- 11 -- 2004
(b) Ground side voltage drop test
Seefigure8.
1. Check the ignition key is in OFF position.
2. The circuit is the same as that described in the
previous test, except that the millivoltmeter (4)
is now connected between the negative battery
terminal clamp and the alternator casing
(negative side of casing).
NOTE: Check the varying load resistance (3) is in
minimum current absorption position (maximum
resistance).
3. Start the engine and increase speed to 2000
rev/min.
4. Increase resistance current load (decreasing
resistance itself) slowly until the ammeter (2)
reads 45 or 65 A. according to the type of
alternator.
5. Note the reading on the voltmeter. This must
not be higher than 200 millivolts.
A reading higher than 200 millivolts indicates
malfunctioning due to excessive resistance in the
external circuits.
If the alternator does not output required power and
the millivoltmeter reading is less than 200 millivolts,
there is a malfunctioning component in the alter-
nator. Carry out the alternator component tests as
described in this section.
6. Stop the engine.
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4. MAXIMUM ALTERNATOR OUTPUT TEST
Seefigure9.
1. Check the ignition key is in the OFF position.
2. Disconnect the negative battery cable and the
B+ alternator wire (4).
3. Connect an ammeter (5) between B+
alternator terminal (4) and D+ wire (1)
(negative side of the wire).
4. Connect a voltmeter (4) between the B+
alternator terminal (5) and earth (ground).
5. Reconnect the negative battery cable. Start the
engine and increase speed to 2000 rev/min.
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