Lawren,
Will you please explain to a poor, confused old electrician how a poor ground can cause over heating of the B+ terminal ?
Unless Mr Ohm has revised his famous Law when I wasn`t watching.

There seems to be an urban myth developing that all eletrical faults (especially on Volvos) are due to "bad grounds"
These can, and do, cause all sorts of puzzling faults but they can not, by definition, be the cause of excess current problems, ie blown fuses etc.
In fact a high resistance anywhere in a cicuit will produce local heating
at that point but must, according to the erstwhle Mr Ohm, reduce the overall current flow.
Colin.