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

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The discussion centers on identifying a specific relay unit in a 1968 Mustang, described as a metal bracket with electronics protected by a removable box. The unit is mounted on the passenger side fender, beneath the starter relay-solenoid, and features a single wire with a rubber cap. Participants suggest that it may be a voltage regulator for the alternator, but a picture is requested for better identification. One user also recommends visiting Mustang forums for more specialized assistance. Overall, the exact function of the relay unit remains uncertain without further visual confirmation.
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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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