Help with Electrical Circuit.

[Mzee]

I have auxiliary brake lights, a switch, and the power source is from an Eastern Beaver. I will appreciate if someone does a simple diagram for me to complete the circuit. Much appreciated in advance.

 

[Checkswrecks]

You want a switch in your aux brake light circuit?
Why the aux power source?


You can simply tap the wires beneath the rear seat for most aux brake lights, so it's not clear what you are trying to do.