Does this mod increase the voltage to the ignition blue wire? I run a 130 amp alt and had to use an adjustable vr (the stock vr would charge at 16v) and even with the adjustable vr I still get voltage jumping between 13-14 volts on gauge? Drives me crazy!
The way its drawn, the mod changes only the regulator supplied voltage. To cut that blue or blue w/white, add the relay and upgrade the voltage to every component downstream would be better.
In many models this wire is first branched under the dash to feed the inst voltage regulator before going out to engine bay. That explains one remedy posted above. I'm not saying I would cut in before that inst' regulator. Surely there's enough voltage through the ignition switch to feed that OEM regulator and not pulse a relay coil. And the bottom line, Current into and out of the ignition switch can be the root cause.