MERCEDES W221 C216 S550 CL550 ELECTRONICS RESETTING RESTARTING RANDOMLY FLASHING SPEEDOMETER

MERCEDES W221 C216 S550 CL550 ELECTRONICS RESETTING RESTARTING RANDOMLY
Random instrument cluster restart/resetting and electronics sometimes not working on my 2007 Mercedes S550 was caused by a low voltage rear battery, car started up fine with low voltage battery because starter is run by the front starter battery not on rear one.
Rear battery was old and only read 7 VOLTS, installed a new fully charged battery and problem was solved.
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