Additional battery OOPS
Yesterday, 03:47 PM
#2
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MY'14 W212 M276 3.5NA @60kMi
AUX getting there!
LAUNCH CodeReader shows that as well.
This internal resistance is a calculated value based on drop-voltage and current.
This is saying your AUX has an increasing hard time carrying load but not yet flagged as bad.
This is what battery drain does... basically lead/acid "sulfation".
When main AGM gets drained so does AUX!
AUX does not have any charge current limitation - Once flat it gets roasted by high current to meet ALT voltage.
The bottom line to prevent that:
CTEK Float charger on main AGM.
Last edited by CaliBenzDriver; Yesterday at 03:49 PM.
