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		No
  P1, P2, P3, P4, P5, P6	E	No
  	B	Yes

• At digital type tester

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

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

Courtesy of SUBARU OF AMERICA, INC.