I had an intermittent ABS light and checked the fuse and it went off. it happened again and i pulled the fuse and put it back in and it went off. replaced the fuse and it stayed off. I assume it to be a poor connection due to dirt/oil/etc.
Now i have an interior switch so i can kill the ABS from inside the cab. i got sick of needing to get out of the car and pull the fuse every time i got to my off road destination. ABS does a great job of preventing break lock-ups on pavement. But on dirt you're always slipping. so your ABS will "half-break" you right off a cliff. in dirt you want to lock up and dig in.
sub-note: when trouble shooting your ABS, dont forget the system doesn't reset until you turn the car all the way off and then on again.