Yingang YG48Q-5A, Maintenance Manual

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YG48Q-5A Maintenance Manual Power supply system
131
Major faults diagnosis
Phenomenon Possible causes Solutions

No electricity in the complete
vehicle:

Replace main fuse;

While turning on with the key,
the meter has no display, and
other electrical functions do
not work.

Main fuse is blown;

Main fuse circuits contact poorly;
 Accumulator’s positive and
negative poles contact poorly;

No electricity in accumulator;

Ignition switch failed;

Ignition switch outgoing line and
the main cable poorly plugged;

The main cable related circuit
open circuit or short circuit

Replace main fuse

Re-plug.

Reconnect;

Recharge or replace;

Repair or replace;

Re-plug.

Repair or replace;

Low accumulator voltage:

While powering on, the
meter’s voltage alarm lamp
blinks; or the accumulator’s
terminal voltage is less then
12V.

The vehicle has been stored for
too long, and the accumulator
has discharged automatically;

Charging circuit fails in the
complete vehicle.

Accumulator fails to store
charge.

Recharge it with DC voltage
stabilizing charger;

Check the charging circuit.

Replace accumulator.

Accumulatorcharges
insufficiently;

After the engine is started, the
meter’s voltage alarm lamp
blinks; or the accumulator’s
terminal voltage is less then
13V.

Variable voltage rectifier’s
outgoing line is poorly contacted
or plugged with the main cable or
magneto;

Related lines of the main cable
are open or shorted.

Magneto fails;

Variable voltage rectifier fails;

Accumulator fails to store
charge.

Re-plug

Repair or replace;

Replace the magneto;

Replace the variable voltage
rectifier;

Replace accumulator.

Accumulator overcharged;

Large amount of air bubbles
burst out from the
accumulator.

Variable voltage rectifier fails.

Replace it.