3 –   2 Repair manual  SWE100, 120, 120L, 120S, 140, 140L, 200D © BT 
General safety rules
Electrical system
T code Valid from serial no. Date Order no.
841×842×843 6061850- 2012-08-30 258946-120
3.2  Electrical system
When working on the electrical system of the truck, remember the 
following:
• a short circuit may occur if metal objects come into contact with live 
electrical connections. This can result in burns. Remove watches, 
rings and other metal jewellery before starting work.
• always use insulated tools while working on the electrical system.
• always switch off the truck's power supply before opening the hoods 
to the drive assembly and the electrical system.
• disconnect the battery when using electric welding equipment. The 
welding current can enter and damage the battery.
• always remove the battery plug when carrying out maintenance on 
the truck, unless the instructions in this repair manual state 
otherwise.
• blow electric motors clean using compressed air.
• clean electrical panels, PCBs, contactors, contacts, magnetic 
valves, etc., with a moist cloth and a cleaning agent.
Note!
Risk of short circuit that may damage electrical components.
Do not break the warranty seal on the PCBs.
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