Mazda MX-5 1990 Workshop Manual page 291

CHARGING SYSTEM
G
TROUBLESHOOTING
Check 1
Check if battery voltage is above 12.6V
I----I~
Check battery (Refer to page G-8)
~--------~--~--~------------------~
YES
1. Turn ignition switch ON
2. Check if voltage exists at each terminal of alternator
I---~ Check wire harness (Refer to page G-6)
YES
1. Start engine
2. Check if alternator warning lamp goes off
I---~ Check alternator (Refer to page G-12)
YES
Check if drive belt tension is OK (Refer to page 0-15)
YES
I-------J~
Adjust drive belt or replace (Refer to page G-15)
Check for dark current (Refer to page G-3)
Check 1
Check 3
BATTERY
CHARGING SYSTEM
WARNING LAMP
Check 2
~h
Terminal
OFF
B
Approx. 12V
L Approx.
OV
S Approx. 12V
05UOGX-010
ON ON (Idle)
Approx. 12V Approx. 14V
Approx.
1V Approx. 14V
Approx. 12V Approx. 14V
05UOGX-011
G-7