Lets not "cross" anything on a circuit, you can burn yourself, melt your screwdriver, burn up circuitry on the lift. Instead, plug the lift in, measure acrost the coil on the solenoid while depressing the lift switch. You should see voltage acrost the coil. If you do not see voltage acrost the coil while depressing the lift switch. Remove your handle and your grab bar and check your lift switches. Depressing the lift switch will allow voltage to flow to the solenoid. When you have your meter on the switch if you see voltage thats okay, but when you depress the switch you should see 0 volts. If you switch your meter to Ohms, when you depress the switch you should see less than 1 ohm. Make sure the battery is disconnected from the unit while Ohming out components. Your switch may be okay and the plastic cover that goes over the switch may be worn out as it has a cross like pattern on the back side of the cover that actually makes contact and presses the switch when you push on it.