Possible Failures In The Electrical Equipment And Guidelines For Troubleshooting - Belarus 3522.5 Operator's Manual

7.4 Possible failures in the electrical equipment and guidelines for trouble-
shooting
7.4.1 General information
The structure of an electrical equipment of the tractor «BELARUS-3522.5» includes
electric elements (switches, relays, electric motors, instruments, flashlights, headlights,
fuses, break-in relays, sensors and etc.) and also wiring system and the electrical connec-
tors for coupling of an element with power supply and with body ground. For facilitation of
the task fulfillment and of search for failures in the electrical equipment the electric circuit
diagram is enclosed to the present operation manual (Annex D).
Before starting the troubleshooting procedure for any loop, take a good look at the
electric circuit diagram to clearly realize the functional purpose of the loop. A search may
be narrowed by gradual identification and exclusion of the proper operating components of
the single loop. In case several electrical elements are disabled, blow out of the respective
fuse or null "ground" (in many cases distinct electrical elements may be closed on a single
fuse or on the unified "ground" terminal) is the most probable cause of failure.
Electrical equipment failure can often be explained by the simplest reasons like
terminal corrosion, fuse breakdown, fusible element burn-out or transfer relay defect. Carry
out the visual inspection of all the fuses, wires and loop electrical connector before starting
more certain fault checking of its components.
If the diagnostic instruments are used for failures search, use the electric circuit dia-
gram enclosed to decide carefully on which points of the loop the instrument shall be con-
nected to in order to improve the localization of failures. Among the main diagnostic in-
struments there are electric circuits testing apparatus (multimeter), voltmeter (12 V-test
lamp (about 21 W) with connecting wires set can also be used), loop interval conductivity
indicator (tester) with the lamp, own power supply unit and connecting wires set.
Electrical circuits failure diagnostics is not a difficult task in case of clear notion of
the fact that circuit is supplied to all electrical components (lamps, electric motor and the
like) from the AB от АКБ by wires through the switches, relays, fuses, fusible elements,
and then goes back to the AB through the tractor "ground". Any problems related to the
failure of the electrical equipment can be determined by stopping of the electric current
supply from AB or current return to the AB.
Note. The information specified in the present subsection 7.4 "Possible failures in
the electrical equipment and guidelines for troubleshooting" shall be used during trouble-
shooting of the gearbox electronic control system, rear axle differential lock, front driving
axle drive, front and rear power take-off shafts (Annex C) and partially during troubleshoot-
ing of the engine electronic control system (Annex B).
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