Do you have relays on your headlights? That alone really increases their brightness, takes a lot of the load off most of the power circuit going through the dash, and reduces or eliminates the discharge at idle. May be a good idea even with LEDs. Separate circuits with relays for any of the larger power draws that eliminate all the power going through the bulkhead connector and dash cures a lot of ills on our old dinosaurs. And may reduce the size of the alternator that you need as well as protect your under dash circuits.
Now that all depends on where you source the power feed for those relays. Too many use the battery terminal, which does nothing for the current thru the bulkhead connections and puts all that load thru the ammeter where is does not belong.
