Toyota Supra 1990 Manual page 374

CH-2 CHARGING SYSTEM - Precautions, Troubleshooting,On-Vehicle Inspection
Problem
Discharge warning
I ight does not light
with ignition ON and
engine off
Discharge warning
light does not go out
with engine running
(battery requ ires fre-
quent recharging)
PRECAUTIONS
1 . Check that the battery cables are connected to the cor-
rect terminals.
2. Disconnect the battery cables when the battery is given
a quick charge.
3. Do not perform tests with a high voltage insulation
resistance tester.
4. Never disconnect the battery while the engine is running.
TROUBLESHOOTING
Possible cause Remedy Page
Fuse blown . Check "IGN" fuse
Light burned out Replace light
Wiring connection loose Tighten loose connections
I C regu lator fau Ity Replace IC regulator CH-6
Drive belt loose or worn Adjust or replace drive belt CH-3
Battery cables loose, corroded or worn Repair or replace cables
Fuse blown Check "ENGINE" fuse
Fusible link blown Replace fusible link
IC regulator or alternator faulty
Check charging system CH-4
Wiring faulty
Upper
Level
Lower
Level
CH0415
CH0263
Repair wiring
ON-VEHICLE INSPECTION
1. INSPECT BATTERY SPECIFIC GRAVITY AND
ELECTROLYTE LEVEL
(a) Check the specific gravity of each ceiL
Standard specific gravity
When fully charged at 20°C (68°F): 1.25 - 1.27
If not within specifications, charge the battery.
(b) Check the electrolyte quantity of each ceiL
If insufficient, refill with distilled (or purified) water.
2. CHECK BATTERY TERMINALS AND FUSIBLE LINKS
(a) Check that the battery terminals are not loose or cor-
roded.
(b) Check the fusible links for continuity.