Boost Starting or Charging Engine Batteries If any mistake is made in the method of connecting the booster cables, it may cause an explosion or fire. Always do the following: Turn off all electrical equipment before connecting leads to the battery. This includes electrical switches on the battery charger or boost starting equipment. When boost starting from another machine or vehicle do not allow the two machines to touch. Wear safety glasses or goggles while required battery connections are made.
HAOA310L Figure 44 24 volt battery units consisting of two series connected twelve volt batteries have a cable connecting one positive terminal on one of the 12 volt batteries to a negative terminal on the other battery. Booster or charger cable connections must be made between the nonseries connected positive terminals and between the negative terminal of the booster battery and the metal frame of the machine being boosted or charged. Refer to the procedure and illustration in “Starting Engine With a Booster Cable” on page 3-7 of this manual. Connect positive cable first when installing cables and disconnect the negative cable first when removing them.
The final cable connection, at the metal frame of the machine being charged or boost started, should be as far away from the batteries as possible. OP001759 1-43 Safety