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The bottom of a bosch type 12v relay there are numbers
#30 = big power wire 12v constant
#85 = ground
#86 = 12v switched connects dash switch
#87 = output or controlled device
#87a= 12v with relay off

There are some relays with dual #87's, these are dual outputs for left and right etc.

There are some relays with a single #87 switched output.

The relay with the #87-#87a are used like low and high etc. The limit is only your imagination and skill.
You don't need to use an output or lug if it does not fit your application.

Michael S.
 
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