DAF CF65, CF75, CF85 Series . Manual — part 493
5
CF65/75/85 Series ≥0E621376
Batteries
DIAGNOSTICS
2-3
SYMPTOM: BATTERY HOT DURING OPERATION WITH EXCESSIVE WATER CONSUMPTION
Possible cause
Remedy
-
Overcharging or
-
charging voltage too high
Check the charger (voltage regulator)
SYMPTOM: BATTERY HAS EXPLODED
Possible cause
Remedy
-
Fire or sparks during or just after charging
Ensure good ventilation and exercise due
caution as regards fire and sparks
-
Short-circuiting by tools
Be careful where tools are put down
-
Internal defect (loose connection)
Replace the battery
SYMPTOM: DEFECTIVE ALTERNATOR AND/OR DIODES (RADIO AND OTHER
POLARITY-SENSITIVE EQUIPMENT NOT WORKING)
Possible cause
Remedy
-
Reversed battery polarity or incorrect
charging
Discharge the battery and charge in the correct
direction
If necessary, replace the battery
SYMPTOM: BATTERY IS INACTIVE (NO VOLTAGE)
Possible cause
Remedy
-
Internal open circuit
Replace the battery
-
Battery very deeply discharged
Charge the battery and test it; replace if
necessary
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DIAGNOSTICS
Batteries
CF65/75/85 Series ≥0E621376
2-4
2.2 SERVICE LIFE
The service life of a battery is significantly
shortened if it used “cyclically”.
This means that the batteries are used a lot
without being charged.
For example when using a tail lift, cab heater,
microwave oven or cooler box.
This is why batteries in commercial vehicles and
vehicles used for international transport often fail
prematurely (within 1.5 years).
The battery must be charged whenever the
voltage measured across the battery falls below
12.5V. If the battery is not charged, the
“sulphating process” will begin.
This is a chemical reaction in the battery that
produces lead sulphate. Lead sulphate adheres
to the battery plates and can cause
short-circuiting between the plates, reducing the
capacity of the battery.
However, most lead sulphate breaks down when
the battery is recharged.
If a battery is used (discharged) while it is not
being charged by the alternator, short-circuiting
between the battery plates will occur sooner.
This reduces the capacity and consequently the
service life of the battery.
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CF65/75/85 Series ≥0E621376
Alternator
DIAGNOSTICS
3-1
3. ALTERNATOR
3.1 FAULT-FINDING TABLE
SYMPTOM: ALTERNATOR NOT PRODUCING POWER WHEN IDLING
Possible cause
Remedy
Open circuit in connection 15 on alternator
Repair connection 15
Connection 15 on alternator short-circuited to
earth
Repair connection 15
Internal defect
Replace regulator
SYMPTOM: ALTERNATOR WARNING (YELLOW)
Possible cause
Remedy
Open circuit in “S” connection
Measure the regulated alternator voltage with as
many consumers as possible switched on and
with the engine turning above idling speed
Open circuit in “L” connection
Check/repair wiring
Open circuit in connection 15
Increase the engine speed to approx. 1500 rpm.
If voltage is now present, check connection 15
on the alternator
Voltage difference between “B+” and
“S” connections is greater than 2.5V
Check all contacts between alternator and
batteries (contact resistors).
Internal battery resistance too high
Voltage too low <16V
Check alternator drive. Check wiring on contact
resistors. Check regulated voltage
Open circuit in voltage regulator
Replace voltage regulator
SYMPTOM: ALTERNATOR VOLTAGE HIGH (RED)
Possible cause
Remedy
Voltage too high > 31V
Measure voltage
Internal defect
Replace regulator/alternator
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DIAGNOSTICS
Alternator
CF65/75/85 Series ≥0E621376
3-2
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