Volvo VNL 780 Operator's Manual page 453

Battery Jump Starting and Charging
DANGER
DO NOT attempt to jump-start a vehicle
equipped with Delco Maintenance Free
batteries if the test indicator is light
yellow. Replace the battery instead.
Jump-starting may cause battery to
explode causing skin burns from acid or
serious personal injury or death.
WARNING
Always wear eye protection when
working around batteries to prevent the
risk of injury due to contact with sulfuric
acid or an explosion.
To access the batteries on a vehicle equipped with side fairings, open the fold-out fairing.
On the second battery from the front, there are special, larger brass posts installed to accept
jumper cables.
When jumping batteries to start an engine, it is important that the jumper cables are
connected directly from one set of batteries in one vehicle to the other set of batteries in the
other vehicle (unless vehicle is equipped with optional Emergency Start System). This way
the cranking current is carried through the proper starter wiring.
Note: Make sure the cables are routed under the fairing, then connected as shown in
illustration. Close and lock the fairing before climbing into the cab.
MAINTENANCE AND LUBRICATION 443