Starting System & Charging System: Generator: Inspection: Diode

CAUTION: There is the possibility of damaging the diodes if a mega-tester (used to measure high voltages) or a similar measuring instrument is used. Never use a mega tester or equivalent for this test.

Check for continuity between the diode lead and terminal E or B. If continuity is not as shown in the table, replace the rectifier.

At analog type tester

Tester lead		Continuity
-lead	+lead	Continuity
E	P1, P2, P3, P4, P5, P6	Yes
B	P1, P2, P3, P4, P5, P6	No
P1, P2, P3, P4, P5, P6	E	No
P1, P2, P3, P4, P5, P6	B	Yes

At digital type tester

Tester lead		Continuity
-lead	+lead	Continuity
E	P1, P2, P3, P4, P5, P6	No
B	P1, P2, P3, P4, P5, P6	Yes
P1, P2, P3, P4, P5, P6	E	Yes
P1, P2, P3, P4, P5, P6	B	No

Fig 1: Checking Generator Continuity

Courtesy of SUBARU OF AMERICA, INC.