97 Dak 3.9 auto....265K now
after I hooked up for electric brakes, the light started coming on, replaced the rear sensor, differential oil change and all was fine....UNTIL
after I get about 30-40 miles pulling our camper the light comes back on, no change in braking , but after you turn it off it clears and is good for awhile.
without the camper it will run forever with out tripping the light... any ideas?

 

no wheels locking up to trigger it? I can't think of anything other than it's detecting a variance between front and rear wheels.