Looking for advice. Packing up from Alum Creek, my left flasher which is also the brake light wouldn't work. Checked it with voltmeter. The 7-way pin is providing electric where it should for the right and left brake lights. The sockets themselves are both getting electric (11.86 volts on left side). Even so, I undid all grounds I could find, cleaned them, and reattached them. Same thing. I cleaned the plug, same thing. I switched bulbs, same thing. My right brake light/flasher light is working, and my left is not. I even took apart the socket and by hand connected the connectors inside the socket to the bulb, and it wouldn't work...but if I check it on the voltmeter, I get power. Any thoughts?