Fusible link???

Just replace the entire ground cable (after reading this I am going to replace mine also).
A fuseible link or any other fuse for that matter will never be placed on the ground. It must be on the power side of the device.
If it was higher voltage and the fuse was on the negative then if you touched a device while touching a fender or some other metal, it would give you something to talk about (shock)
You may feel something at 12 volts by nothing live 116 vdc like I have touched. Feels like someone hits you with a baseball bat on your entire body. Hurts bad