SECTION 06: ELECTRICAL
22
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version) – Sec 06 revised June 2017
6. Shorted cells, loss of active material from
plates.
7. Driving conditions or requirements under
which the vehicle is driven for short periods
of time.
8. A constant drain caused by a shorted circuit
such as an exposed wire or water infiltration
in junction boxes causing ground fault.
9. Failing to close disconnect switches during
the night.
2.10 TROUBLESHOOTING
If a battery is known to be good and then has
not performed satisfactorily in service for no
apparent reason, the following factors may
reveal the cause of trouble:
1. Vehicle accessories and disconnect
switches inadvertently left on overnight.
2. Defects in the charging system, such as
high wiring resistance, faulty alternator,
regulator or battery equalizer.
3. A vehicle electrical load exceeding the
alternator (or battery equalizer) capacity,
with the addition of electrical devices, such
as cb radio equipment, a cellular phone or
additional lighting systems.
4. Defects in the electrical system, such as
shorted or pinched wires.
5. Extended driving at a slow speed while
using many accessories.
6. Loose or poor battery cable-to-post
connections, previous improper charging of
a run-down battery or loose hold-down
clamp bolts.
7. High-resistance connections or defects in
the cranking system.
2.11 “BATTERY VOLTAGE WARNING”
PICTOGRAM
If the
“
battery voltage warning
"
(battery
voltage incorrect) pictogram shows up in the DID
(driver information display), check the voltmeter
gauge to determine if the battery voltage is too
high or too low.
2.11.1 Voltmeter Gauge Definitions
Voltmeter drops below 24.4 volts dc
o
Check alternator output.
o
Check voltage regulator.
o
Check battery connections.
o
Check battery cells.
o
Check battery equalizer connections.
Voltmeter exceeds 30 volts dc
o
Check alternator output.
o
Check voltage regulator.
o
Check battery connections.
Battery balance
Note
Allow at least 15 minutes to balance batteries
after any corrective measure has been taken.
1. Batteries out of balance (difference greater
than 1.5 volts between the two battery
banks).
o
Check battery equalizer connections.
o
Check equalizer cables for proper gauge.
o
Check battery connections.
2. Demand for 12-volt power exceeding rated
amperage output of battery equalizers
causing batteries to go out of balance.
o
Reduce 12-volt load or install additional
battery equalizer(s).
