65 Barracuda Alternator/Ammeter/Starter Relay
Since your wiring is not OEM, it's difficult to help you.. But without an ammeter, the alternator should basically go direct to the battery. You should have a big fuse or fuse link in that wire. Then, the main feed to all loads in the car should be a nice big wire, also fused/ fuse link, that feeds all the heavy loads. The light switch B1 terminal should be fed off that (head lights only), the fuse box "hot bus" which feeds full time hot circuits like brake lights, parking lights, etc and a feed off that for the power to ignition switch.