Hi, do yourself a favour and in addition to the existing earth terminal solder a second wire from the same strand and screw/bolt it to the body....This  will give a etter earth. And as you guys are saying this has happened on a virtually new car ...it is bound to happen  again ..Geee they havent replied to me about my advertising request here I wonder if I should be sharing my 13 years of knowledge?????

I believe Chris has a very large workload stick with it he has always replies.

Thankyou