Ignition On, Power Source: Nytro

[TurboTime]

Looking for a good power source for a snow performance meth kit with variable pump. Didn't want to use the red/white wire as the amperage fluctuates. Below is the selection of wires. I was thiking the brown wire would work???
Thanks,
Kevin

 

[Some_Boost]

why not use any wire that has key on power and just use a relay to take the load off the circuit. that would be easy to do and a safe route .