Thanks,

Since I only have a basic meter, I will just stick with the contact gap.

If I find any corrosion, discoloring, etc on the contact points, is it permissible to clean the points with carb. cleaner, or some fine grit sandpaper?

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member