I ordered a new fuel tank selector valve from Advance (first ordered one from AutoZone, but had the wrong terminal type, so returned it, then checked online at Advance, and looks like the same valve as AZ, but has a different terminal end to change on the wiring) but then checked the voltage at the switch and it's getting 12v, but unhooked the connector at the valve and don't get any voltage at any of the slots. Is there an inertia switch, relay, or another fuse between the dashboard tank switch and the valve on the frame? Don't want to go to expense of the valve, if that's not the problem. '89 f250, 7.3 diesel