Honda EP3 Service Manual page 77

Charging System
Alternator Overhaul (cont'd)
Rectitier Test
16. Check for continuity in each direction, between the
B terminal and P terminals, and between the E
t e r m i n a l a n d P t e r m i n a l s o f e a c h d i o d e p a i r .
A l l d i o d e s s h o u l d h a v e c o n t i n u i t y i n o n l y o n e
direction. Because the rectifier diodes are designed
to allow current to pass in one direction, and the
rectifier is made up of eight diodes (four pairs). you
musttest each diode in both directions for
continuity with an ohmmeter that has diode
checking capability: a total of 16 checks.
. lf any diode is faulty. replace the rectifier
assembly. {Diodes are not available separately.)
' lf all the diodes are OK, go to step 17.
/--:',t- -L . --
-
-o \--
l'-=
B P "
P,
P.
P,
P.
4-34
1 9 .
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Alternator Brush Inspection
1 7 . M e a s u r e t h e l e n g t h o f b o t h b r u s h e s ( A ) w i t h a
v e r n i e r c a l i p e r { B ) .
. l f e i t h e r b r u s h i s s h o r t e r t h a n t h e s e r v i c e l i m i t ,
r e p l a c e t h e b r u s h a s s e m b l y .
. lf brush length is OK, go to step '18.
Alternator Brush Length:
Standard (New): 10.5 mm (0.41 in.)
Service Limit:
1.5 mm (0.06 in.)
Rotor Slip Bing Test
18. Check that there is continuity between the slip rings
{ A ) .
. lf there is continuity, go to step 19.
. lf there is no continuity, replacethe alternator.
Check that there is no continuity between each slip
ring and the rotor (B) and the rotor shaft (C).
. lf there is no continuity, goto step 20.
. lf there is continuity, replace the alternator.
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