upgrading regulator

67Dart273 said
Let's step back a moment. Just what are you upgrading? In other words, what year car did you start with? Are you just upgrading amperage, or going from the old 69/ earlier regulator to the newer 70/ later?

VOLTAGE!! Most these old girls have problems with the circuit path to the resistor. This is battery, starter relay, fuse link, bulkhead connector, ammeter, ignition switch, back out the bulkhead.........to the resistor

VOLTAGE DROP in that path will cause the new (or old) system to OVER charge (over voltage) One way around it is to cut loose all underhood loads fed by the ignition run wire to the ignition/ regulator and use a relay in that circuit

So far as a branch point, yes, you can connect there at the resistor, but what about the OLD regulator wire? it connects to the same point.

IN FACT if you are going from the older 69/ early regulator to the 70/ later, you can use the OLD wiring and ADD one wire just tap into the ballast as proposed and run that down to the second field connector on the new alternator

thank you sir, it just dawned on me what you meant by the OLD regulator wire, and I'm going that route, but....still going to replace that wire because someone put a black wire there, and I'm going to keep it all blue. :) you are very helpful/knowledgeable, thanks.
not sure about this statement: VOLTAGE DROP in that path will cause the new (or old) system to OVER charge (over voltage) One way around it is to cut loose all underhood loads fed by the ignition run wire to the ignition/ regulator and use a relay in that circuit.
are you saying I should put a relay in the brown wire from the bulkhead? the yellow wire from starter relay goes to ignition, then comes back from ignition as brown, that is what I am connecting to my ballast resistor. is this correct?