What do the CBs in the JB20 do?

explanation of CB1, CB2, CB3 and up

CB1 = RIH power. Normally ON. To cycle power to the RIH, turn off CB1 for at least 10 seconds, then turn on again.

CB2 = used to provide power to solenoid valves for overhead reels such as oil, coolant, and ATF. Should normally be ON when used.

CB3 and up = these function as Control Bypass switches. They should normally be OFF. When they're ON, the relay to the left is bypassed allowing for unauthorized dispensing of fluids.

Note, if the fluid can still be dispensed in bypass when the CB3+ is in the OFF position, further troubleshooting should be performed.