Low Battery Charge After Vehicle Sits for a Short Time

Some 2021 Express and Savana vans equipped with the 6.6L V8 engine (RPO L8T) may have a low battery charge after sitting for a short period of time. The low battery charge may be due to the a voltage draw caused by the anti-rotation tabs on the positive-side cables, located at the mega fuse, contacting the mega fuse mounting stud nuts.

If the vehicle has a low battery charge, check for battery cable contact with the mega fuse mounting stud nuts. If there is contact, trim the anti-rotation tabs on the positive battery cables.

To trim the anti-rotation tabs, first remove the battery, mega fuse cover (Fig. 10, #3) and the fasteners that secure the pre-positive cable (Fig. 10, #1) and post-positive cable (Fig. 10, #2) to the mega fuse.

 

Fig. 10

 

Approximately 2 mm (Fig. 11, #2) of the anti-rotation tab (Fig. 11, #1) should be trimmed from the bottom of the tab.

 

Fig. 11

 

Be sure to only cut enough of the tab so that it does not contact the stud or the fastener. (Fig. 12) Do not cut the anti-rotation tab flush. Cutting the tab flush may cause the cables to rotate and contact the fasteners or the mega fuse mounting studs.

 

Fig. 12

 

After trimming the tabs, reinstall the cables onto the mega fuse post and tighten to specification. When tightening the fasteners, hold the cables so they do not contact the studs. (Fig. 13)

 

Fig. 13

 

For additional information, refer to Bulletin #20-NA-225.

 

– Thanks to Matt Singer

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