Toyota Supra 1990 Manual page 377

V
Voltmeter
CHARGING SYSTEM - On-Vehicle Inspection
CH-5
Terminal F
CH0328
8.
Ammeter
CH0067 CH0068
If the voltage reading is less than standard voltage, check
the IC regulator and alternator as follows:
• With terminal F grounded, start the engine and check
the voltage reading of terminal B.
• If the voltage reading is higher than standard voltage,
replace the IC regulator.
• If the voltage reading is less than standard voltage, repair
the alternator.
INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the high
beam headlights and place the heater fan control
switch at HI.
(b) Check the reading on the ammeter.
Standard amperage: 30 A or more
If the ammeter reading is less than 30 A, repair the alter-
nator. (See page CH-6)
HINT: If the battery is fully charged, the indication will
sometimes be less than 30 A.