Hello, I have a 1994 g20, the high beams and fog lights work fine but both of the low beam headlights do not work and nor do they have power going to them, I tested with a multimeter while they were on. Could it be a bad relay? And if so where is that located at so I could the good ol shake test and or replace it. I just received this van I am not too experienced with the electronics side of it.

Chevy Van G20 3/4 Ton 5.7 L 8 Cyl