No, there are no pulses of electricity. The timer sends a steady voltage to a solenoid to open for how many minutes you have the zone set for. After the timed minutes the timer turns off the voltage to the solenoid. With the timer in the off position the sprinkler system should not have started up. Electric spike or not with the switch off it should be OFF. Perhaps your timer is defective and needs to be replaced. I do not like the Hunter timer that came with the house. I did not find it user friendly to operate. Up north I have a Orbit 6 station timer. Easy install, easy to operate. Cost is about $45.00 and works great . I installed the Orbit timer here and couldn't be happier. Simple and easy to operate.
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