alternator voltage regulator

Can you explain what you mean by charging 100% full time? What else do they do except for short dips that you mentioned? But don't do anything unless you have done the BIG 3 - alternators will not overcome that! By increasing the voltage with the same response time, your lights & LEDs will still dip. The difference is that the lights will probably burn out quicker, and you'll be replacing batteries more often (assuming exploding batteries don't cause you to replace the vehicle first). If you existing alternator keeps 14.2V, then alternator size is probably not your problem. The voltage will drop if they can't keep up. (I'm talking steady-state - not transients etc.) If you continue down that route, I hope your alternators suit being paralleled. But as per earlier - the BIG 3 first!!

Big ideas, big explosions, it's a route I wouldn't want to take. My suggestion, Big 3, 2nd battery to run the accessories and a split charging system, NOT 2 alternators.

Well the man has said he wants zero drop no matter what, and therefore the big 3 MUST be done. (Not that zero drop is possible...) But I too await sparks: over-voltage; paralleled alternators; single regulator for both alternators (see the other thread)... But IMO what is meant by "charging 100% full-time" will test the man's mettle. Mine charges 100% full-time (and over 100% for the first few minutes), and responds quicker than .75 secs. Then again, mine is not a rewound OEM alternator.