video switchbox probs

[bandcworkhorse]

I have the old style Winegard video switchbox. Recently the tv will not pick up ANY stations, and displays NO SIGNAL or WEAK SIGNAL. Input from the DVD player works fine. I have 12 volts at the connector at the rooftop antenna, but zero volts at the connector going to the tv. Shouldn't I have some voltage on the coax going to the tv?

[94-Newmar]

The most likely culprit is the barrel connector that screws onto the antenna. Those are prone to corrosion and over time their ability to pass signals degrades. Before I would spend a lot of time looking for anything else I would change it out and see if your problem resolves itself. No you should not have any voltage on the inbound line from the rooftop antenna to your TV.