Not sure what amp clamp test you mean an AC clamp ammeter to starter? 400a to a starter seems normal to me.

It does not take much corrosion at all to zap voltage. At 400A it would be 3 v loss (12v becomes 9) with a mere 7.5 m Ω. (0.0075 Ω)! A very good contact from a normal switch like a window switch will be between 5 and 10 mΩ. It does not take much to make a cable or connection worthless


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