Electrical Installations
06-9
Operation when the motor is running
As soon as the motor is running, a relay connects the starter
battery and the caravan battery in parallel. The D+ signal sits
close to the dynamo. Therefore, the dynamo charges both
batteries. If the D+ signal no longer sits close to the dynamo,
the two batteries will be separated from each other again. In
this way, the starter battery cannot be discharged by equipment
in the caravan.
The 12 V supply for the refrigerator only functions when you
are driving. If the motor has stopped, the 12 V operation of the
refrigerator is automatically turned off again.
To charge a discharged caravan battery optimally while
driving, disconnect the 12 V operation of the refrigerator and
turn off as much equipment as possible that uses 12 V.
Checklist
• Turn off the motor.
• Switch on the 12 V master switch.
• Turn off all equipment that uses 12 V.
• Start the motor.
• Is the battery voltage of the battery charger above 1 volt?
• Have the poles of the caravan battery been attached pro-
perly?
• Is the connection between the battery charger and the on-
board control panel functioning properly?
The voltage of the caravan battery must rise if
- the engine speed is above the idling speed,
- the vehicle‘s battery is not completely discharged.
If this does not happen after using the dynamo to charge the
battery, check the following:
• Is the fuse in the supply line to the vehicle‘s battery functio-
ning properly near the vehicle‘s battery?
• Have the poles of the caravan battery been attached properly
to the battery charger?
• Is the fuse in the supply line to the “D+“ signal functioning
properly near the vehicle‘s battery?
• Is the “D+“ signal sitting close to the battery charger?
There must be a voltage of 12 V here when the motor is
running.
• Is the connection between the battery charger and the on-
board control panel functioning properly?
Operation by means of a 12 V caravan battery
All of the equipment is automatically supplied from the caravan
battery if the mobile home is standing still without a 230 V mains
supply and with its engine turned off. The 12 V master switch
must be switched on.
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