[Mal]

I would agree with Ron about the Run In Hot section. This basically connects to the Run output of the Ignition switch to energise the regulator and provide the warning lamp circuit (both active when the engine is expected to run, isolated when expected not to run).

The fusible link is a type of fuse usually moulded into the cable linking the alternator to the battery. It should be rated about 150% of the rated alt output current, so that it will not blow if the alternator is supplying its rated power.

The fusible link is incorporated to protect the system by blowing if the diode pack in the alternator fails. In this case the diodes have a high probbability of failing to a short circuit, allowing enormous currents to flow throught the wiring harness, and melting all circuits in close proximity greating a fire hazard. The link blows and isolates the alternator from the balance of the wiring. The alternator would be destroyed electrically (but not mechanically) by the time the link blows.

Do not substitute a fuse or circuit breaker for the link, as if it blows or is switched open while the alternator is operating, the sudden load loss will cause the alternator output voltage to soar to the point where it destroys the diode pack. This is the reason the fusible link is rated much higher than the alternator.

The fusible link is always located outside the loom wrap, so that if it does blow the loom is not damaged.

You should be able to source matching connectors via an auto electrician.