Mysterious wires/plugs in engine compartment

[k30Dually]

Real quick not sure what wires/plugs these are inside engine compartment. Fairly long maybe to engine mounted accessories?
1983 K30 sbc forgot colors each wire but here's a couple pics...one on far left has 4wire flat plug wich is burnt

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[75gmck25]

Does the truck have a auxiliary battery tray on the drivers side? With a 2nd battery it would have a relay on the driver’s side fender well to control the charging. It isolates the 2nd battery when the ignition is off, and the middle plug looks like the right type for the original relay.

 

[Finkaire]

Top plug looks like it may be the A/C clutch wire?