Help! Fusible link melting conduit!

[Not a bronco]

Hey guys I just put a Lincoln Mark 8 single speed fan on my K5. and since I've done that my 16 gauge fusible link has been melting the conduit on it, it hasn't been blowing the link but it has been getting so hot it's melting plastic, and I noticed also my 140amp internally regulated alternator is getting way to hot to touch.
I think I have it all wired correctly with 10 awg for power and 16 awg for trigger. I have the 70 amp relay power running straight to the positive battery post with a 50 amp breaker, the fan ground running on to the firewall ground and then I have fuel injection with built in fan control that triggers the relay ground. I can't see why it's heating up the fusible link since the power isn't wired through it. So I think the alternator must be doing it? Do I need a 14 gauge fusible link?
Any ideas would be great thanks!