Sounds like an electrical connection to me. Pull the tank and clean/grease with dialelectic grease. While you are there, bleed the fluid from the ABS unit. There are instructions posted on this site, but basically it is the two bleed valves on the top of the unit. I always bleed the lines to the brakes first, then the ABS, that way I know that it is getting clean fluid. Be sure to check the condition of the lines. I just replaced all the stockers with braided stainless. Much better, and I was just starting to get tiny black specks in the fluid from the lines breaking down. It seems that 00-04 have that problem. $185 from Cyclebrakes and an afternoon made it all better. Have fun!