Get a measurement of the current draw at start. I think the 3.0 pulls about 225 cold start and 175 re-start. I took some voltage drop measurement from the 12v socket to B+ jump point and it worked out to about 1/300 of the current

Eg: .75v drop .75*300=225a

You need a DMM that will register peak DC voltage but that will get you a sense of starter health.

.625*300=187.5 was close to what I would get on an immediate restart. That was with my 3.0.

Most of the cases i read where somebody thinks a bad battery is causing weak starts it's really the starter.


–awr–

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)