Starting/Charging Systems (H4DO): 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.

1. 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
E	P1, P2, P3, P4, P5, P6	[Yes]
B		None
P1, P2, P3, P4, P5, P6	E	None
	B	[Yes]

• At digital type tester

Tester lead		Continuity
-lead	+lead
E	P1, P2, P3, P4, P5, P6	None
B		[Yes]
P1, P2, P3, P4, P5, P6	E	[Yes]
	B	None

Fig 1: Checking Continuity Between Diode Lead And Terminal E Or B

Courtesy of SUBARU OF AMERICA, INC.