Not to mention almost ALL automotive electrical loads are rated for 12 volts. This will fry any onboard electronics like stereos, CBs, and the ignition module. What I'm hearing from you is that you want to install an adjustable regulator because you want the system voltage to be above 14 volts, because you think this is better. However, the internal regulator inside a 3G alternator is doing the exact same job as the clunky stock regulator on the fender - it just does it with better transient response. Newer alternators have the regulator built in because modern regulators are much smaller, and it's much more efficient to shorten the path between the regulator and alternator. The voltage regulator has nothing to do with any of this it's job is very simple. Alternator output is a function of the alternator's windings. So the alternator is upgraded to one that can produce more current. The reason people upgrade their charging system is because for a given set of custom loads (like fog lights, electric fan, etc), the alternator can't put out enough current to satisfy the regulator's demands in the presence of all these extra loads. When you shut these loads off, the electrical system's voltage will increase unless the alternator's current output is reduced, which the voltage regulator does. ![]() As you place more demand on the electrical system (such as turning on the headlights, the heater, etc) then the voltage regulator must call upon the alternator to produce more current in order to maintain the same voltage. The voltage regulator's job is to keep the truck's electrical system at around 14 volts. ![]() ![]() The electrical system's voltage and the alternator's current output are not the same. The electrical systems in these trucks are rated for 12 to 14 volts. What was wrong with the feedback last time? When I tried to help you last time, you never responded. There is no difference between '78 and '79. The regulators were the same for years and years - at some point they evolved from the original electromechanical style to electronic, but the function remained the same.
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