Quote:
Originally Posted by colinstubbs
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You've found the most likely answer.
It won't be a short to earth, it will be a bad or corroded earth so will need cleaning.
While you're cleaning the earths, clean all you can find including battery to body, battery to starter, alternator to engine (it's usually a short link wire and the ends get dirty/break off and all kinds of other things), don't ignore an earth in the cleaning process just because it doesn't seem relevant to the immediate problem, the others won't be far behind this one!
Using some silicone grease on the earth connections after cleaning will help prevent recurrence, sometimes also called battery grease or dielectric grease. Failing that Vaseline is a passable substitute but has drawbacks if it gets hot.
