Alternative Connection Diagrams; Devices Connected Directly To Battery Negative; Use Of Devices Deriving From The Battery Switch; Use Of Specifi C Devices - Littelfuse 08096500 Series Manual

8.3 - Alternative connection diagrams

Installation of the battery switch as in Pict. 1 can cause problems linked to various types of vehicle system, or
according to the client's specifi c requirements.
The solutions to some of these problems are described in the following paragraphs.
The installation method must be carried out in accordance with ADR regulations.
The following connection diagrams only indicate the variations to be carried out with respect to the
original connections, as set out in Picture 1 (
8.3.1 - Devices connected directly to the battery negative
To allow continuous use it is possible to connect devices directly to battery negative, having fi rst disconnected
the system earth supply cable: this connection must provide specifi c protection in accordance with current
ADR regulations.
This solution can, however, create undesirable earth returns; e.g. if the supply for the telephone or vehicle
radio is connected to negative, it is possible that current returns may be present caused by connection to
earth of the antennas for such devices.
These devices will always be active, even when the battery switch is OFF and will not therefore be able to
benefi t from the protection of the battery switch itself.
For connections see the diagram set out in Picture 2 (
8.3.2 - Use of devices deriving from the battery switch, able to be supplied even without the ignition key
In normal conditions the operation of controlled deactivation of the battery switch is regulated by the presence
or absence of voltage on the grey wire, i.e. the position of the Key.
In fact, with the battery switch ON, removing voltage from the grey cable will cause deactivation only after a
time period of 55 seconds.
It is, however, possible that key operation could cause improper operation in the event that you want to
use devices normally available without the ignition key on non-transformed vehicles, such as, for example,
parking or emergency lights, heating or air conditioning, load hoists.
With the following diagrams it will be possible to activate the battery switch even with the Key in the "OFF"
position. Even in this situation automatic deactivation will remain active for voltage drops caused by short-
circuit. The activation phase will always be initially commanded by P
Using the following diagrams, the battery switch will remain active with the Key out, and for this reason will
absorb nominal current even with the alternator off. To avoid premature battery discharge in the event of
prolonged activation of the battery switch, it is advisable for the operator to deactivate the product when the
engine is off using the emergency button, in order to reduce the battery switch consumption to zero.
8.3.2.1 - Use of specifi c devices
In this case activation of the battery switch will be commanded, besides by the Key, only by certain specifi c
and direct devices, such as, for example, the parking lights switch, emergency lights and the Webasto.
On the disappearance of all indicated service commands, and with the Key in the OFF position, the battery
switch deactivates with a 55 second delay. In this way there will be no consumption problems due to prolonged
battery switch activation.
For connections see the diagram set out in Picture 3 (

8.3.2.2 - Use without ignition key

In the event in which one wants to maintain the battery switch permanently active, independently of the
specifi c devices, it is possible to connect the grey wire to the electrical 30 – system positive line instead of the
15 key, as shown in Picture 4 (
In this case the controlled deactivation function will be inhibited and the battery switch will be able to be
manually deactivated only by using the emergency button.
Evaluating possible premature battery discharge due to prolonged battery switch activation.
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0-(ON)
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