This bass has a standard circuitry for an early sixties Gibson EB-0 bass. The loom is accessed by removing the back control plate. As with any single pickup guitar it has a very simple circuit: just a single volume control, and a single tone control, with two capacitors and an output jack. Have a look at the images, illustrations, and schematic to see how the circuit is put together.
More info about this 1962 Gibson EB-0 | More about EB-0 circuitry in general
The loom also holds some information useful for dating vintage guitars: the potentiometers have a manufacture date code (the date the pot was made), which although not precisely when the guitar was made, is generally pretty close.
Below: two views of the wiring loom. Both the volume and tone pots are 500kΩ audio taper, marked 1346241, (manufacturer and date code: it signifies they were made by Centralab (134) in week 41 (October) of 1962) and BA811-1053 (part number). These early sixties Centralab pots typically had their codes stamped onto the sides of the casing, requiring removal from the bass to read - but at least they are generally not covered with solder, so are always accessible.



The above illustration demonstrates the exact circuit connections in the wiring loom above.

Gibson EB-0 schematic that corresponds to the wiring in this bass.
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