Took one of my other rigs for an emissions test yesterday. It's a diesel with an isolator and a winch. The emissions techs needed a 12volt power source, and since there is no cig lighter, they had to hook to the battery. I couldn't exactly see because of the hood, but it looked like they were screwing around more where the isolator is. If they did indeed hook into the isolator for a power source, could they short it out? After the test, there is now a significant voltage drop--about 10V on the gauge.