Best place to get 12v source in engine bay??

[ericcamaro]

I am installing a water injection kit on my supercharged 525i and need to know where the best place to tap to get 12v and 10 amps? I see a connection to hook straight up to the battery but shouldnt I put it on a 12v switched source? btw there really isnt much room to put this pump in either, its gonna be a squeeze.

[Blitzkrieg Bob]

pick a lightly used accesory and tap in

[BillionPa]

the B+ junction box would be the easiest. you can use a relay to switch it.