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When fault finding most people will over look the earth side.
Also when chasing a problem where the fuse keeps blowing, I always start with any wiring or electrical items that may have been added to the vehicle such as radios extra lights.
You will be surprised how many times a trailer plug has caused problems with tail lights, stop lights or indicators.
If the vehicle has panel damage have a look around that area for damaged wires.
Bad connections will give off heat, depending on what circuit this is in you may be able to feel the heat with your hand (sometimes even smell the connector melting).
I have always found it best to step back and find out exactly what the complaint is or whats not working, before jumping in and pulling things apart, chances are you will disturb the problem and then it will start working again and you are left scratching your head.