Problem Area Determination Section
A.
BATTERY
UNDERCHARGED
1.
Indicator Lamp On.
a.
Perform Open Diode-Trio
Test
(Test
No.1).
2.
Indicator Lamp Off (Ignition
on
and engine stopped).
a.
Perform Regulator
Test
(Test
No.2)
b.
If Regulator
is
O.K., the cause
is
probably
an
open field circuit and Alternator must
be
removed for repair.
3.
Further Investigation Requires Alternator Removal and Repair (diodes).
B.
BATTERY
OVERCHARGED
1.
Regulator Shorted, Replace Unit.
Alternator/Regulator Tests
Test No. 1
Open Diode-Trio
Test
With ignition
on
and engine not running (jumped not attached and
no
electrical load), check for
battery
voltage at terminal A and for
1.5
to
3.0
volts at terminal
B.
Add
jumper
JU1
between
terminals A and
B.
Start engine and run
at
idle. If indicator lamp now goes
"off"
and charging
voltage is present
at
terminal
A,
the diode-trio is probably
"open"
(defective) and alternator should
be
removed for repair.
VOLTAGE
REGULATOR
IGN.
IND.
SW.
LIGHT
RED
Ll."+--
POS.
+
OUTPUT
EXCITE
(TO
IGN.
SW.
OR
OIL
PRESS.
SW.)
BLK
GRN
I
VOLTS
I
+ -
FIELD
L.....f----'f---I B
LK
~~~-------------------------'
RED
STEP
TEST
POIN
Ir--:"'-~)
l'
A (B+)
11
2'
i:==~
B
(REG)
II
~:-="')
" 3 A (B+)
INOICATION
BATTERY
VOLTAGE
1.5
TO
3.0
VOLTS
WITH
IND.
LIGHT
ON
13.5
TO
15.0
VOLTS
&
IND.
LIGHT
OFF.
(JUMPER
ATTACHED.
ENGINE
IDLING)
'JUMPER
NOT
ATTACHED
OPEN DIODE-TRIO TEST
85
(B+)
BATTERY
~
..
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