That would appear to be a solid state regulator and it's definitely wired differently than stock. You need to trace the wires and see where they go and where they come from.
Here is the wiring diagram from the stock factory issue.
The solid state regulator should be wired the same as the stock regulator.
You should have a 16 gauge brown wire coming from the firewall connector to the no. 4 terminal on the regulator which will be on one end or the other and it should be marked 1 2 3 4.
The no. three wire was a red 12 gauge wire that comes from the alternator battery wiring junction. It is easy to check because it is hot all the time.
The no.2 wire was awhite wire that goes from the regulator to the alternator R terminal, and the no. 1 wire was a blue wire that runs from the regulator to the alternator F terminal.
If the no. 2 and the no. 1 wires are switched then you would not charge and the battery would drain in a short time especially when driving with the lights on.
If you decide to convert to an internally regulated alternator, Start a thread in the electrical forum or have a mod move this one over there and I will help you do it right. VV