What does this box(relay) unit do on a '68 Mustang?

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SUMMARY

The box (relay) unit discussed is identified as a voltage regulator for the alternator in a 1968 Mustang. It features a metal bracket with two holes and houses electronics, including diodes, protected by a removable cover. The unit is mounted on the passenger side fender, beneath the starter relay-solenoid, and is connected by a single wire with a rubber cap. This configuration is typical for voltage regulation in classic Mustang models.

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Big Block
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I have no idea what this box(relay) unit does. Can someone identify this beast and tell me what it does!
It is a metal bracket with a lip that has 2 holes in it. On the underside are the electronics, diodes and stuff proteced by a removable box which is fastened to the unit with 2 screws. There is only 1 wire coming out of this box unit and has a rubber cap on the end which fastens onto a bolt sticking out of the unit. No other wires attach to this grounded box unit.
This unit is mounted on the inside fender (passenger side) followed by the starter relay-solenoid on top of it secured by 2 bolts, washers and nuts.
Any thoughts...
 
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How about a picture?

I have a 1967 stang with 428 cobra lemans with medium riser 427 intake and I still need a picture.

An educated guess would be the voltage regulator for the alternator.
 

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