A timer consists of vertical cams (disks with pieces missing that sit on a horizontal shaft, the shaft is powered by a very slow geared down AC electric motor as the motor turns; lever switches above and, below the cams ride upon the cams opening and closing to program the machine to fill, agitate etc. the length of the cutout in the irregular disk (cam) is the lengh of time a certain procedure or,device i.e. a spin cycle, or, solenoid takes or, is activated and, it's corresponding switch is closed. All machines come with a small packet usually mounted inside the control center that has a frequency and, duration chart for the timer. this will show you the conectors on the timer that should be closed at a certain time in the cycle you can then manually turn the timer to the spot wher the meter should read continuity The most offen encountered problems with timers are burned switch contacts and, dead timer motors.