blowing 20a fusible link

[56hotrodred]

I have been trying to troubleshoot an electrical problem that when I pull headlight switch it blows my 20a fusible link.

I have been rewiring my rear harness and have a couple of issues there but it is now disconnected until I figure out what I have done up front.

Can I start pulling bulbs or disconnecting things like the wiper switch to see what is blowing the fuse?

I have replaced the headlight switch, put the old one back in and it still blows.

Thanks in advance.

Barry