940 L4-2.3L SOHC VIN 88 B230F (1992)
Connect meter probes between B+ and diode terminals (three measurements).
Read upper section (large diode symbol).
Green section
= diode OK
Red section
= defective diode (open circuit)
Zero
= defective diode (short circuit)
E7 Negative power diodes
Connect probes between D- and diode terminals (three measurements).
Read upper section (large diode symbol):
Green section
= diode OK
Red section
= defective diode (open circuit)
Zero
= defective diode (short circuit)
E8 Exciter diodes
Connect probes between D+/61 and diode terminals (three measurements).
Read lower section (small diode symbol):
Green section
= diode OK
Red section
= defective diode (open circuit)
Zero
= defective diode (short circuit)
E9 Testing diodes disconnected from alternator, using 40 V test voltage
