CDL does not engage when I go to low. 30 amp fuse is good. I installed CDL switch in dash, still no work. I pulled relay and tested it. It passed every single test except continuity between pins 6 and 7. No continuity either direction. This bothers me because it seems like there should be more than one item fail on the test series. With 9 volts applied, I hear the coils snapping the switches in and I get continuity everywhere I should. Any thoughts out there?