Repair Manual

STARTING AND CHARGING
16
16 - 18
CHECKING OF THE ALTERNATOR ROTOR
After the visual checking of the coiling (without heating or oxidation traces), check the
collecting rings for defects (sometimes it is recommended their polishing with very fine
granulation sandpaper).
A. CHECKING OF THE COILING INSULATION
Place the ohmmeter terminals on
chassis ground, on 1 and on one of the M
or N collector rings. The ohmmeter needle
must not deviate ( resistance = ). If it
deviates, there is a short circuit between
the rotor collector rings or current leakage
between coiling and shaft.
B. CHECKING OF THE COILING RESISTANCE
To check the coiling resistance place the ohmmeter terminals on M and N collector
rings; the measured resistance must be 4,6 +/- 0,1 Ù at 20
o
C. If the value of the resistance
is very high the rotor coiling is burnt and if the resistance is zero, there is a short circuit.
VOLTAGE REGULATOR – RELAY
The pick-up vehicles equipped with alternator type 1114.200 have the voltage regulator
fixed on the left front inner wing ;the alternator type 1180 is provided with incorporated
voltage regulator (type 1180.120).
Their characteristics are the followings :
CHARACTERISTICS ADJUSTMENT RANGE
Adjusted voltage [ V ] 13,8 - 14,5
Adjusted voltage at low charge of the alternator [V] 14,1 - 14,5
Adjusted voltage at high charge of the alternator [V] 13,8 - 14,1
Voltage difference between the two adjustment steps [V] 0,2 - 0,6
Maximum IF excitation current [ A ] 5
ALTERNATOR
vnx.su