ABS LIGHT ON

ABOUT TWO MONTS AGO I REPLACED THE ENTIRE DIFFERENTIAL ON MY 1997 MUSTANG GT, SINCE THE ONE I HAD WAS BENT ON THE DRIVERS SIDE FROM SOMEONE CRASHING INTO IT, WHEN I REMOVED THE OLD ONE I CUT THE WIRES TO THE ABS, THE ONE THAT I REPLACED IT WITH I GOT IT FROM THE JUNK YARD AND IT ALSO HAD THE ABS WIRES CUT SO IT TOOK ME 2 MONTHS TO FINALLY PUT THE WIRES FOR THE ABS BACK TOGETHER I ENDED UP CUTTING THEM A BIT SHORTER SINCE THEY DID GET A BIT RUSTY FROM THE BAD WEATHER HERE IN WISCONSIN, ANY HOW I SODERED THEM BACK TOGETHERE AND MY ABS LIGHT IS STILL ON, ANYTHING THAT I DID WRONG OR THAT I HAVE TO REPLACE?