Humm.. Well What i think it could be is that you may have too many lights and neon wired in the car so when they are all on the car dosen't have enough power being supplyed to the ABS brakes. No saying that the brakes wont work but I think that you are drawing enough power that the senser come on..
When you turn off your lights does the ABS light go right out? If so I think thats what the prob is..
You may want to get a more powerful Alternator if that is the case.
Hope that helped.
DD
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