Dual Battery Disconnect - Diesel

WARNING: This page is about a different car, the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Simplified Battery Configuration - Diesel

Courtesy of FORD MOTOR CO.

DISCONNECT

CAUTION: The secondary positive cable remains energized after disconnection and can cause vehicle or component damage.

CAUTION: Make sure the tool does not contact any ground surface to prevent vehicle or component damage.

Fig 2: Disconnecting Secondary Positive Cable From Primary Battery Terminal

Courtesy of FORD MOTOR CO.

Disconnect the secondary positive cable from the primary battery terminal.

CAUTION: Make sure the secondary positive cable does not contact any ground surface to prevent vehicle or component damage.

Fig 3: Wrapping Secondary Positive Cable With Non-Conductive Material

Courtesy of FORD MOTOR CO.

Wrap the secondary positive cable with a non-conductive material to insulate it.
Disconnect the primary battery terminal connections.
1. Disconnect the battery ground cable (14301).
2. Disconnect the battery to starter relay cable (14300).
  
  Fig 4: Disconnecting Primary Battery Terminal Connections
  Courtesy of FORD MOTOR CO.

CONNECT

Reconnect the primary battery terminal connections.
1. Reconnect the battery to starter relay cable.
2. Reconnect the battery ground cable.
  
  Fig 5: Reconnecting Primary Battery Terminal Connections
  Courtesy of FORD MOTOR CO.

CAUTION: The secondary positive cable is energized.

CAUTION: Make sure the tool does not contact any ground surface.

Unwrap the secondary positive cable and reconnect it to the primary battery terminal.

Fig 6: Unwrapping Secondary Positive Cable

Courtesy of FORD MOTOR CO.