Table of Contents
Advertisement
208
FIAT·850 PASSENGER CARS
SERVICE
PROCEDURES
All
repairs are to be limited to exceptional cases,
since, as a general rule,
it
is preferable to replace
a defective regulator unit rather than repair and
reset the same.
In case service operations are to be made, strictly
adhere to the following directions.
Before starting the regulator repairs, the ser-
viceman must have performed
all
checks men-
tioned above, thus being sure that defects are
really present and repairs necessary.
Except for setting and replacement of regulating
resistor. which will be outlined further on, any
disassembly, replacement, or repair of parts in the
remaining components must be absolutely avoided.
The regulating resistor is supplied adequately
packed
in
special containers protecting them from
damage, distortion, grease soiling or other foreign
matter, etc.
Opening the Regulator.
Fig. 334 • Generator regulator GN 2/12/16.
Bottom view.
1. Cutout relay nut. - 2. Current regulator and resistor nut. -
3.
Volt-
age regulator and resistor nut. - 4. Regulator resistor. - 5. Solder-
ing on base for cutout relay and voltage regulator windings. -
6. Voltage regulator series resistor.
Loosen both cover-to-base screws and remove
the cover and gasket.
WARNING
Always bear
in
mind that most troubles, espe-
cially the serious ones, like:
- excessive wear or welding of cutout contacts;
- oxidation of voltage and current regulator
contacts;
- contact pitting and build-up in voltage reg-
ulator and current regulator;
- contact welding in voltage regulator and cur-
rent regulator;
- short-circuited coils;
- burnt windings;
are often due to causes not ascribable to regulator
and which generally originate from troubles in the
TO USERS
GR
51 67 30
J1
generator, such as alteration of field winding re-
sistance, use of improper brushes. damaged cir-
cuits (wires, etc.).
Especially use of improper brushes brings about
a poor commutation, with rapid wear of commutator
segments and brushes themselves. high voltage
drop between commutator and brushes and re-
markable increase of field current.
In such conditions voltage regulator and current
regulator contacts are affected by a current which
is above the standard value.
As the bracket is of iron. sparkling at the contact
area will cause local oxidation.
So both above contacts are isolated and the reg-
ulating resistance of the unit is all the time in the
field winding of the generator, which delivers no
output.
As a rule, regulator operation and life are most
satisfactory. For this reason, the serviceman must
not simply restore the unit to efficiency but should
also test the generator and the entire recharging
system.
+
B
Fig. 333 • Wiring diagram of regulator assembly GN 2/12/16.
GR. Regulator.
~
B. Battery. - G. Generator.
Replacing Regulating Resistor.
IT it has been found that the voltage and/or cur-
rent regulator settings have been altered, namely:
- regulated voltage is low or reduced to neg-
ligible values;
- voltage is no longer under control, but rises
to high values;
- regulated current no longer ranges within
rated limits but rises excessively;
the trouble may be ascribed to an open regulat-
ing resistor or to an alteration in resistor value.
Advertisement
Table of Contents
