Honda Acura NSX 1991, Service Manual, Page: 1089 / 1420

NOTE: As an alternative,
use
a screwdriver and an
ammeter to full field the alternator.
S C R E W D R I V E R
F Terminal into contact with tip of
screwdriver
CAUTION: The voltage will rise quickly when the
alternator is full fielded. Do not allow the voltage to
exceed 18 volts or damage to the electrical system
may result.
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If the amperage is within specification, replace the
regulator.
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If the amperage is not within specification, replace
the alternator.
Charge System Light Test
NOTE: Before testing, check the wire harness con-
nection, alternator belt tension, No. 2 (15 A) fuse
in the dash fuse box and No. 18
A) fuse in the
main fuse box.
1 . Turn the ignition switch on. The charge system light
should come on.
If it does not come on, disconnect the alternator con-
nector and short the pin of the
termi-
nal to ground.
View from
terminal side
If the light still does not come on, check for:
Bad bulb.
An open in the wire between the
light and voltage regulator.
An open in the
wire between the light
and the dash fuse box, or the dash fuse box
and the ignition switch.
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If the light comes on, check the alternator and
regulator (see page
2. Start the engine and let it idle. The charge system
light should go off.
If it stays on this time, check the YEL/BLU wire be-
tween the main fuse box and the alternator.
If the fuse and wire are OK, check the alternator and
regulator
page
If the system is charging, proceed as follows.