Honda-Tech - Honda Forum Discussion - Low Voltage & Idle Issue

What's up guys I've noticed with the key on the ON position, my voltmeter shows 12.4-12.5. Once I turn on the car the volts clock in at 13.9-14.0 and within about 20-30 minutes of driving they go down steadily to around 13.2-13.4. This is with no additional load aside from my boost gauge, PLX wideband, an Apexi AFC and the voltmeter itself driving around during the day.

At night though with the headlights on and the car idling the volts come in at 12.5-12.8 or 13.0 at best and if I switch the oem foglights on it goes down to anywhere between 12.0-12.2 sometimes lower. With either or on (headlights & foglights), or both, the idle is very rough and sometimes the car shuts off when coming to a stop.

I'm running a 130amp Alternator with a 4 gauge wire going straight to the battery. I was running an Odyssey PC680 battery but have since switched back to a conventional Autostart Gold battery from Advance Auto to see if it was the battery but with no luck, same issue. I've also upgraded the big "3" to 4 gauge wires as well.

I was told that this may be an issue that could be solved by upping the idle but turning the idle screw on the throttle body hasn't helped either. It idles around 800-840 right now so I was thinking about maybe bringing it up some thru Crome to see if that changes anything but any other ideas out there? Anyone have an idea on what voltage I should be seeing with the headlights on & off?

Just in case its a 92 civic with a boosted LS running 1000cc injectors again using Crome, no AC, no PS and running a Fluidamper crank pulley. Any help would be greatly appreciated.