There is absolutely nothing wrong with your vehicle. This happens to the security vehicle that I patrol in all the time1. What the problem most likely is, is the wiring. There could be a fuse that is shorting or gfoing bad. Also, Just the wiring it's self. If you could answer my question too, that would be great. I don't know if you know anything about vehicles or not, but I need help. Just click on my profile and look for the question about gas mileage on a 1987 ford thunderbird with a v8. Thank you.