rwding (ignore very small readin
g
s) this will indicate o short circuit
in the diode block.
REGULATOR
FIG.
8
ALTERNATOR CIRCUIT (MOTOROLA)
I
.
.
,-~
\
P
- -
--%
-
n
9n\r
..-I~L.I*~v
L-+<..~~,,
the
O,,Rl,,.
rermlnO,x
,or,
",,i;
l
\U,
--W,""'
"
-.
--
.
-.
.
ground, and ttie positive terminal of the battery and ground. The
.
..
2-
voltmeter reodings should be the same and steady at
12
volts.
If
7,..
+.2,;+>
;$JP$dodings differ or are erratic, check for lwse terminal fixin&,
cq'
broken wires or corroded terrninols.
(c)
Switch
on
ignition, with engine not running, and check the voltage
at the field brush with the regulator unscrewed, but connected.
Connect the voltmeter positive to the outer field brush and the
voltmeter
negotive to ground. The reading should not be greater
than
2
volts.
If
reading is more than
2
volts, check brushes and
if
6
reading
is
0
volts check the regulator connections, ignitian lead to
switch and indicator lamp.
(d)
With ignition on and engine not rurining, check the regulator circuit
by
disconnecting the field lead and measuring ftie voltage acrass the
field winding. The reading should be
2
volts moximum and
if
it is
between
8
and
12
volts, then check the current output as in
(e)
and
(f).
(e)
Carry out a resistance check on the field winding to ensure it
is
not
shorted out, as a short cwld
dornage the ammeter in the following
test. If
a
resistance reading
is
obtoined (approx.
1
to
2
ohms) then
disconnect the field lead and connect a
0
-
3
amp ammeter between
the output terminal
(B+)
and the field terrninal. Stort engine and set
%)
ESPRIT
lssua
04/78
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