93 W9L and trailer ABS lights

Have 07 and 14 trailers. Lately, when hooked to the 93 KW non abs tractor the ABS light on both trailers is likely to be on steady. Will stay on and run truck batteries down if you don't notice it and leave it for a few days. Stays on with key switch off. Doesn't do it every time. Have an 05 379 and the neither trailer gives any problem when hooked to it. Been unhooking trailer cord when I park it overnight just to be on the safe side.

 

Yes, it has trailer hotline button in overhead. I will check and see what effect it has on center pin. Is center pin the only thing that would be hot with key off parked? When it activates light on back corner of trailer it stays lit after you shut key off. Originally, I thought it was something out of whack on the 07 trailer. The 07 has mostly been sitting for a yr or so. But when hooked to the 14 trailer that up until coronavirus mania hit was running about every day, does the same thing.