a/c clutch not engaugin | Ford Forums Jun 10, 2007As I said before, I forgot the circuit. What I suggest is to measure the voltage on the wires feeding the clutch. I forgot if the relay in the fuse box APPLIES 12V to the clutch OR RETURNS THE 12V TO GROUND when activated. For some reason, I think it returns one side of the clutch's 12V to ground rather than applying the power. How to Troubleshoot a Daytime Running Lights Problem | It Remove the cover from the fuse box located in the engine compartment. On the underside of the fuse box cover on Ford and Chevrolet vehicles there is a diagram depicting where each fuse is located within the fuse box. Locate the "DRL" or "Daytime Running Lamp" fuse. If you are unsure of the fuse location, consult your vehicle's owner's manual.