will be energized through contacts 42c until the stop float opens stopping pump 2 when the stop float opens power is cut from cr2 42 so it will de energize causing contacts 42b to close energizing cr3 s coil 62 contacts 62a will be closed while contacts 64a will be opened when the stop and lead float close power will feed through and energize cr2 coil 42 thus pump two is again the lead pump pump one will be the lag pump when the selector switch 92 is in the 34 upper 34 position whenever pump 2 is running cr3 r 64 is always energized if the lag float switch closes power will energize cri 28 starting pump 1 which will remain on until the stop float opens because power feeds through contacts 28c keeping cr1 28 energized and pump 1 on if the selector switch is positioned in the 34 center 34 position the board will be in the normal 34 alternating 34 mode if the lead lag selector switch is desired to be mounted remotely from the board a 4 position terminal block is placed on the board and wires are run to the remote switch fig3 a shows the timing diagram of a conventional alternating relay when the pump 1 selection is set shown at 150 pump 1 is run and the pump 2 selection is not made until pump 1 is de energized shown at 152 fig3 b shows that the inventive alternating circuit makes the selection for the next sequence pump while current pump is running the pump.