Acura NSX 1991 Manual page 771

Main Menu
Charging System
Troubleshooting
(From page 23-103)
Apply a load with the VAT-40
until the battery voltage drops to
between 12-13.5 V.
Is the amperage 85 A or more?
With the engine speed still at
2,000 rpm, full-field the alter-
nator.
Is the alternator output 85 A or
more?
Turn the ignition switch off.
Disconnect the 4-P connector
from the alternator.
Turn the ignition switch ON (II).
Check for voltage in the YEL wire
at the IG terminal and in the
WHT/GRN wire at the S terminal
of the 4-P connector.
Is there battery voltage in both
wires?
Replace the voltage regulator.
Table of Contents
Charging system is OK.
NOTE: Attach a probe to the VAT-40 full-field test
lead, and insert the probe into the full-field access
hole at the back of the alternator. Switch the field
selector to "A (Ground)" position momentarily, and
check the amperage reading.
CAUTION: The voltage will rise quickly when the
alternator is full-fielded. Do not let it exceed 18V
or you may damage the electrical system.
REGULATOR
(Located inside the end cover
Test and repair the alternator
(see page 23-106).
IG (YEL)
S (WHT/GRN)
Repair open in the YEL wire or the
WHT/GRN wire.
FULL-FIELD ACCESS HOLE
END COVER