Thanks for the reply. After your reply I researched the Aux water pump and that could indeed by my issue unless the wiring to the pump is either open or shorted. I will check that out tomorrow. A new battery was installed earlier this year and given the area where the battery goes & where the aux pump is located the wiring might of been damaged during installation.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6