FORD 2002 E-450 v.1 - Manual (Page 223)

The auxiliary battery is located on the passenger side frame rail.
Gasoline engines
Disconnect:
1. Disconnect the primary battery
ground cable.
2. Disconnect the auxiliary battery
frame ground.
• Remove the ground bolt.
• Pull the cable away from the
frame and make sure that the
cable does not contact the frame.
Maintenance and specifications
223