Starting several weeks ago my WTS light started flashing for no apparent reason as I was going down the road. It would randomly start and the next time I started the truck, it wasn't on initally. It's gotten to where it's flashing before I get out of the driveway now. I know that flashing indicates an open circuit. My basic check-over found nothing disconnected. This morning I disconnected the cables at the grid heater and I got no flashing light on the way to the farm. I came home for lunch and it was flashing like before. My question is this: Is there anything besides an open circuit that can cause that light to flash?
The FSM isn't much help because the tests need an analog mulitmeter and I don't think those have been made since Ben Franklin's life time It says that the needle movement can determine if the heaters are good, bad, or dirty by checking resistance, but I don't have a needle on my multimeter to watch.
Thanks guys