Not enough power. I live in Chicago so I have a lot of free time on the Express. If you don't get high RPMs, it dies immediately. I didn't have any flashlights or accessories, just a low-level radio. He constantly turned off the power, turned off the radio, and drove the car forward. Once you get to high RPM, everything is fine, so it passes the voltage test. It's not much less than similar brands of higher quality, so please do it. Do yourself a favor and just grab one of these. You save…