That’s an uncovered solder spliceyour alt/batt wire looks loose and has been very hot
The cut stuff looks like horn relay wiring or as "Davek" said the washer...if it was a one-wire conversion there wouldn't be the two wires connected to the field terminals of the alternator.1969 Charger- I assume this is some kind of one-wire conversion? I’m not up on my Mopar electrical knowledge yet. What are all the cut off wires for?View attachment 1297893
Thanks!