Starting System & Charging System (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.