Should have three under the hood. The brown one from the junction block on the rad support to the battery; an orange one from the voltage regulator to the main splice; [main splice has four red wires spliced together, one to the voltage regulator via the orange fusible link, one to the alternator output, one to the horn relay and one to the battery via the junction block]; and a black one from the horn relay to the main power up terminal at the firewall junction block via a red wire at the junction block.
Sometimes a pain in the behind to find if indeed one does burn out, but most likely the best way to protect the car from burning up from overheated wires.
The fusible link will only burn out if there is a serious short to ground or battery internal breakdown. Unlike an inline fuse it will not burn out with temporary shorts such as burning your favorite snap-on wrench by unwittingly touching a metal body part while removing the positive battery cable while the negative is still attached.
I also thought there was a fusible link in the headlight circuit but cannot be certain about that one, or any of the rest for that matter but that is what I believe to be fact.
Oh yeah, sometimes the main splice is right at the horn relay.