The light is on because the ABS has a problem. Unless you know what you are doing, take it to a professional. Another thing to remember about ABS is that it's easy to damage those delicate wheel...
The Aurora Borealis or "Northern Lights", themselves, cause no problems. They are just a shimmering, rippling glow high above the Earth in the night sky. About the only problem I can envision them...
check bulbs first. cheapest, easiest and more likely. if not flasher relay is probably defective. on 1999 gr. cherokee remove access panel below steering wheel. it is top of junction box in center...