This Preliminary Information communication provides information to the technician for a concern with the radio going blank briefly after an auto stop event and the engine is cranking to restart.  This concern could be related to an open or high resistance in circuit 6386. The negative battery connections at the auxiliary battery should be checked along with using the GR8 battery tester to test the auxiliary battery with the cables disconnected. Check the integrity of the X4 connector at the X50D battery fuse block and make sure the F4UB 175 amp fuse is tight in the X50D battery fuse block.Â
