[lnfletcher]

When you check the fuse panel and get 7v, where are you getting your reference ground?
If at the battery, then you have a bad connection to the fuse block, if elsewhere, it could be a bad ground or bad connection to the fuse panel.
Check with reference to battery ground and you eliminate one half of the question.
Check the actual connection on the battery positive to main cable connections for obvious problems.
Hope this helps.