I have a blue bird bus. When I turn the lights on they stay on but when I start to drive they blink on and off. I've checked for water in the lens. Anything else I can look for?

Check your headlight switch, this problem has been solved on some heavy
Duty trucks with replacement of the switch. Also check for possible loose ground connections.

Pull the switch out of the dash and pull wire harnesses off it and plug the wire harnesses onto the new switch and see if that solves it. Sorry I am not familiar with how to remove the headlight switch from a blue bird bus.
Check for corroded or loose ground connections before attempting the
Headlight switch.

You did not state the year model of the bus, but some of the older models had a circuit breaker built into the headlight switch, to prevent a short circuit form causing a fire.This often starts cycling off and on when vehicle is moving because there is an intermittent short circuit in the lighting circuit.More than likely on the running,parking, or headlight circuit.See if anything has rolled onto or pinched any of these wires, front or rear.
While a loose ground will cause an intermittent dimming of the lights, a short circuit will cause an intermmittent, quick blink-off- on of the light.(listen for a subtle "Clicking" sound near the headlight switch when lights blink off and on.
Also, a loose ground will make all lights appear "dim" or "yellowish", even when not blinking.Sometimes this occurs when body work has been performed and the sheet metal componets are not properly "Bonded" to the frame, (electrically, bonded, that is)

Hope this helps.
Shadetree