Why does a 40 Ford headlight switch have 2 battery connection?

The wiring diagram from Vanpelt's site only shows one.

Bob
 

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The battery is connected through one YR wire to the light switch. This YR wire comes from the circuit breaker.
 
Sorry, I thought it was the same as a 40, it's actually a 41 pickup, like this one.

There is a "B" terminal on both sides.
 

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The headlight power was sourced from one circuit breaker; while the park, tail, and panel light power was sourced from another circuit breaker.
 
The headlight power was sourced from one circuit breaker; while the park, tail, and panel light power was sourced from another circuit breaker.

Yep, they did that until '53. Here's a schematic of the 48-52 headlight switch wiring, not sure if it's the same, but likely is:
 

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