TROUBLESHOOTING 21.9 STARTING THE ENGINE WITH A BATTERY JUMPER CABLE The current-supplying battery and the discharged battery must have identical nominal voltages. The capacity of the current-supplying battery must not be significantly lower than the capacity of the discharged battery. The cross-sections of the battery jumper cable and the cable clamps must be suitable for the battery type. 21.9.1 CONNECTING THE JUMPER CABLE A short-circuit may damage parts of the electrical system. A short-circuit may occur, if: the positive (+) and negative (-) clamps touch each other when you connect them to the battery, or if they are conductively connected (e.g.
by a tool), the operational and the defective machine touch each other and current is already flowing when the positive poles are connected, a clamp slips off and touches the machine! Firmly connect the clamps. When connecting and disconnecting the cables, pay attention that the cable ends neither touch each other nor the machine, the two machines do not touch each other. 1 - Turn the start switch of the defective machine to '0' (OFF). 2 - Connect one clamp of the battery jumper cable to the positive terminal (+) of the discharged battery. 3 - Connect the other clamp of the battery jumper cable to the positive terminal (+) of the charged battery.
4 - Connect one clamp of the battery jumper cable to the negative terminal (-) of the charged battery. Danger of explosion! When you connect the last clamp to the engine block of the defective machine, sparks are produced which may ignite the gas produced in the battery! Connect the last clamp as far away from the battery as possible. 5 - Connect the other clamp of the battery jumper cable to the engine block of the machine with the discharged battery. 116