I'll try to give as much detail as possible. I only have a couple hours per day to trouble shoot and I'm hoping someone can point me in the right direction.
PROBLEM:
Car isn't seeing 14.0+ volts while running but battery is.
New alternator (Nissan Quest) New battery (Mazda Miata)
Test at battery reads 12.6v with DVOM while off
Test at battery reads 14.2v with DVOM while running
Test at ignition reads 12.2v with DVOM while off
Test at ignition reads 13.9v with DVOM while running
SAFC-2 shows 13.3v at start up drops to 12.8v while driving
EVERYTHING FROM HERE IS BASED ON SAFC-2 READING
HIDS on 12.3v-12.6v then back to 12.8v
Electric fan #3 on 12.6v then back to 12.8v
When volts hit 12.6 or lower car wants to stall, I have to gas it
I can't drive very far because the volts will continue to drop over time it's been down as far as 12.0v.
ALSO:
Relay under the dash near the fuse box to the left buzzes occasionally and the brake light comes on when it buzzes. It will buzz while idling (parked or red light, stop sign etc.) if I turn the wheel back and forth.
The battery light on the dash glows faintly
Car starts everytime no problems.
I need some assistance.