ok, i'll pull it out tomorrow look at it more closely.i had it out sat.looking at it did'nt see anything suspicious the flat black wire was anchored down solid but maybe something is going on inside that rheostat box i did'nt see the first time. the 18 ga. black grnd wire on top of the sender grnds to the inside cab wall.so if thats not the problem then it must be inside the sender itself.correct?