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Starting at the main pump timer.
connection lug #1 has one wire from the circuit Breaker and one jumper wire that goes back to the back of the timer.and a jwire called out as left jumper to booster pump timer
Lug #2 one wire from the main pump and a jumper wire over to the timer for the Booster pump on its #1 lug.
lug #3 has one wire from circuit breaker and a second jumper wire to the back of the timer. also has a jumper to the booster pump timer called out as right jumper
Lug #4 one wire from the main pump and jumper wire to Booster pump timer to lug # XXXXX