SECTION 06: ELECTRICAL
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version) – Sec 06 revised June 2017
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2.5.2 Removing
surface
charge
Disconnect cables from the battery and attach
alligator clamps to the contact lead. Connect a
load equal to half the cca (cold cranking amps)
across the terminal for 5 seconds to remove
surface charge from the battery.
2.5.3 Testing Battery Cables
Check all cable ring terminals and connections
to determine if they are in good condition.
Excessive resistance, generally caused by poor
connections, produces an abnormal voltage
drop which may lower voltage at the starter to
such a low value that normal operation of the
starter will not be obtained. An abnormal voltage
drop can be detected with a low-reading
voltmeter as follows:
DANGER
To prevent the engine from starting during
these tests, remove circuit breakers cb91 and
cb99 located in the vecr of the rear electrical
compartment. Once the tests are completed,
reinstall cb91 and cb99.
1. Check voltage drop between grounded
(negative) battery terminal and vehicle frame
by placing one prod of the voltmeter on the
battery terminal and the other on a good
ground (unpainted surface) on the vehicle.
With the starter cranking the engine at a
temperature of 70ºf (21ºc), voltage reading
should be less than 0.3 volt. If the voltage
reading exceeds 0.3 volt, there is excessive
resistance in this circuit.
2. Check voltage drop between the positive
battery terminal and the starter positive
terminal stud while the motor is operated. If
the reading is more than 2.5 volts, there is
excessive resistance in this circuit.
Note
If it is necessary to extend the voltmeter lead
for this test, use a #16 (awg) or larger wire.
3. Check voltage drop between the starter
housing and a good ground on the vehicle.
The reading should be less than 0.2 volt.
DANGER
Any procedure other than the following could
cause personal injury or damages to the
charging system resulting from battery
explosion or electrical burns.
Wear adequate eye protection when working
on or near the batteries. Ensure that metal
tools or jumper cables do not contact the
positive battery terminal (or a metal surface in
contact with it) as a short circuit will result. Do
not attempt to jump start a vehicle suspected
of having a frozen battery because the battery
may rupture or explode. Both the booster and
discharged batteries must be treated carefully
when using jumper cables. Follow exactly the
procedure outlined later in this section, being
careful not to cause sparks.
2.6 BATTERY
CHARGING
The batteries used on this vehicle can be
charged either on or off the vehicle. Use the
booster block or the provided 110v receptacle to
charge the batteries when they are left on
vehicle and
make sure that the main battery
disconnect switch is set to the
“on”
position.
Caution
AGM (absorbed glass mat) batteries require a
voltage-limited charger, ideally fitted with a
battery temperature sensor for temperature
correction of charging parameters.
Make sure your charger is multi-staged and
minimally provides the following voltage values:
Charge voltage: 13.8-14.6 volt @77°f (25°c)
Float voltage: 13.4-13.6 volt @77°f (25°c)
Charging AGM battery on a typical constant
current or taper current charger – even one
time – may greatly shorten its life.
Please consult odyssey owner’s manual
included with the OEM publications for charging
tips and maintenance guidelines
.
