When you say yellow fuseable link, is it actually connected at the battery terminal, or under the cover next to the battery? I have similar age, but no yellow fuseable link.
What are the wire colours?
The trouble with pulling a fuesable link at the battery is that it's going to kill power to alot of things all at once, so is not so good at narrowing down the problem.
Is the relay clicking underneath the panel between the battery and guard?
How about removing fuses in the panel in the footwell one at a time.