Mercury Repair Questions? Ask a Mechanic for Answers ASAP
This can be an indicator of a broken tone ring or loose bearing. The abs/trac/advance trac system is design to work together in sync. If you have either fault listed above this will cause your concern. The system is in constant active/ready state I find it odd that with the lights on the advance trac would try to be active in snow conditions unless it see's the speed sensor inputs erratically. I would remove the abs fuse and have the truck scanned and system tested. way too expensive to guess, typical bearing replacement runs around 300 bucks(do not use a cheap bearing). How are your tires tread good and all the same size?
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