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A
VOLVO
10303
9
Fig. 3-23. Wiring
diagr.
a JJl for testing voltage regulator
A
Alternator
D
Ammeter
0-50 amps.
B
Battery 60
Ah
E
Voltage regulator
C
Vol tmeter 0-20 amps.
F
Warning lamp 12
volts.
2
watts
Load the alternator with
10-15
amps, for
exa
mple,
full-beam headlights, and read off the
voltage.
The
VO
LVO
103040
Fig.
3-24.
Voltage-temperature diagram for cold voltage regulator
nator.
The eng ine
should
be turntng over at
about
1500
r.p.m.
(3000
alternator r.p.m.) when the measur-
ing
is bein-g
carried
out. When the regulator ambient
temperature
is aho ut
25
0
C (77
0
F).
the voHage should
be
13.85-14.25
volts.
For
other ambient temperatures,
see
Fig.
3-25.
volt·
a ge should also lie on this occasion between
'6.r__---.-___r--.--~-r__~-___r-_._-,..._-r_____,
13.1
-
14.4
volts. For ambient temperatures other than
25
0
C (77
0
F),
see the diagram in Fig.
3-24.
If the voltage is outside the tolerance limits, the regu-
laif'or should be
repla,
c ed.
If t,he voltage regulator is to be tested more accura-
tely, install it in the vehicle which should then be
driven for about
45
minutes at a speed above
50
km.p.h.
(30
m.p.h.).
The reason for the driving is to enable the regulator
to obtain the correct working temperature.
N.B. The vehicle must be driven. Iif' is not sufficient
just to have the engine idling.
Immediately after, or preferably during driving, mea-
sure the voltage between B
+
and D- on the alter-
3 : 10
-20
o
+20
+50
+80
Fig. 3-25. Voltage-temperature diagram for warm voltage regulator
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