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Begin OCR Text:
_ l mmediately afte r. o r preferab Iy du ri ng drivi ng.
measu re the vo Itage between B + a nd D- on the
a Itern3to r. The eng i ne sho u Id be tu rn i ng over at
about 25OO r. p. m. when the measuri ng is bei ng car-
ried out. Whe n the regu lato r am b ient tem pe ratu re
is a bout 25'_ C (77 ' F). the voltage s hou Id be 1 3.85
-1 4 .25 vo Its . Fo r other a mbi ent tempe ratu res, see
fig . 3-25.
- ZO O +2 O + _O + 5O + _O
__X'x
Flg. _-25. Volt8ge-temper8ture dl8gram Ior _8rm voltage
l reguI8_r FA U LT T _ A _ I _ _
FA U LT _ EA_ O _
Altern ator does not cha rg e . Worn or inaufficiently tenaioned fan belt.
Brea kag e i n charg i ng ci rcu it.
Wo rn brushes.
B reakage i n rotor wi nd i n g .
Breakage i n isol ation diode.
Fau Ity regu lator.
C ha rg i ng wea k or i rreg u lar. Worn or inaufFiciently tenaioned fan belt.
l nterm ittent brea k3ge i n c ha rg i ng ci rcu it.
Worn brushee.
B reakage o r sho rt-c i rcu iti ng i n on e o r severa l rec_
ti fi er diodee.
(Brea kage i n a d iode reduces the charg i ng cu rrent
about 5 a m ps. Sho rt_ci rcu iti ng i n a d i ode Ii m its fhe
a Iternato r cha rg i ng current to 7_ a m ps a nd cau-
ses a ru mbl i ng sou nd i n the alternato r.)
Pa rtia I short_ci rcu iti ng i n the roto r.
Brea kage or sho rt-ci rcu iti ng i n the stator.
fau Ity reg u lato r.
Too hig h charg i ng . Fau Ity regu lator.
Faulty term i nals o n regu lato r or a Ite rnator.
Short-ci rcu iti ng i n i sol ati on d iode . 3 ; 1 1
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