Interconnect Wire Kit
From FICMrepair.com

Want to do a far better job load balancing the over 1300 amp draw that occurs when the starter engages or perhaps you already own the Basic Cable Kit and want to pick up the upgrade to what the Deluxe Cable Kit offers?
The FORD factory only provided a two-gauge wire to interconnect the driver and passenger side batteries and didn't do an awesome job of grounding the engine to the driver side frame. The result is a passenger side battery that seems to nearly always fail before the driver side one does and the very real possibility of the torque converter on the automatic-equipped trucks deciding to weld itself to the front pump....yeah, not awesome!
Add this wire set to your existing cabling to allow the driver-side battery to take a more active role in helping the passenger-side battery with engaging the starter and glow plugs while protecting your trans!
Item includes:
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a pre-terminated on both ends 4/0 wire from the passenger side (positive post) battery to the driver side (positive post) battery
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replacement bolts, nuts, and washers to replace the one-use only factory bolts
slide in place heat shrink tubing to further protect the 4/0 wire from the sharp edges of the radiator core supports -
1/0 grounding wire from negative on the driver side battery where it connects to the frame on the driver's side to the driver's front of the motor
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Necessary hardware to connect this extra grounding wire to the existing drilled and tapped hole on the passenger front of the motor
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