Bad alternator?

[garetth]

Hey guys , looking for some insight before i purchase a quest alternator.

It seems like my alternator isn't big enough and causing the ignitor or injectors to maybe not get full power and cause my afrs to go weird when cruising or idle.

First just some specs
93 240sx
RB20DET
Vg30et steel wheel turbo - compressor 0.60 A/R, Turbine 0.63A/R
GTR Injectors/Resistor
Z32 maf
ECU Tuned by Carl H
Altima fan wired to relay then a switch
Battery relocated to trunk

Now when the car is idling if i sit there without altima fan or consol fan on it will idle around 12 but then the more accessories i turn on the higher the afr goes. If i turn altima fan on and sit there at idle it will rise to like 15. Now while cruising it will be in like 15s sometimes but then if i take it to like 4500 rpm then cruise it will be around 13 for like 30 seconds then go up. And after driving if i come to a complete stop at like a redlight or something the afr will stay around 13 then after 30 seconds of sitting there it will start to rise to like 15 again. Could this be because of the small rb20 alternator and the stress I'm putting on it by having battery in my trunk and all my gauges?

[mixeds14]

is ur oxygen sensor good, when mine took a crap my afr were really f-up when idling and while cruising..

[Carl H]

i'd upgrade alternators...stock 80a alternator stuggled with efans when i had efans on my setup many moons ago.
altima fans do move massive airflow but they also are quite power hungry.