Stolen from another bit of this site!
As Fitz said, the fusible links are the problem. They are not visible though. From the battery there should be a large wire and then one slightly smaller wire/s. Follow these along the top of the inner wing, you'll need to remove the electrical tape from around them, as they're tied together and shielded. Each fusible link will have a plasticy style netting over them. get hold of each end of each of the links and tug. The blown one will stretch farther than the rest. Alternatively place a multi-meter probe at each end of the links, with the ignition on, the faulty one will show a voltage on it
Lynall