Alternator problems

[1997 Eclipse]

had to replace my original alternator with a second hand one. My problem now is that the ABS light occasionally comes on when sitting in traffic for a long will as I am only gettting about 10 Volts ( at night with spot lights, head lights and Stereo running) from the Alternator at idle - 600rpm due to my 264/272 HKS camshafts. Should I replace my alternator or increase the idle or both?

 

[Kevin90GSX]

Just the ABS light or various lights? In my experience and trust Ive had alot when it comes to alternators, its probably the alternator. If you just got a used one rather then new or rebuilt Id go get a rebuilt one and try that. Even with all that equipment you should still be fine. Im running an amp with 2 10's, 6 gauges, and dash gauges and still hold 12 to 13volts at idle.