I'm trying to figure out what would be the best thing to tap for a relay that I'll be using for some fans for my amp rack. I can't seem to find any 12v constant wires in the trunk area....do they exist? If not what would be the easiest/best thing to tap from the front of the car to run to the back?

 

i took a a powerblock from a old 85 suburban and taped to the battery, has 12V to it all the time, i run my Neons, air horns and strobes off it, has a fuse on it so you dont over load it.

 

If you don't mind running a wire from the front to the back, you can tap into the incabin fuse box. I know the hazard lights fuse is always on even if the car is off. You'll need the "mini add-a-fuse" thingy from autozone if you want to tap the fuse box. Oh and all the power should be 12v

 

well how much power are those fans gonna need. keep in mind ur sitting right on top of the power line to ur amp, its on all the time unless u also tap into the dimmer. would work ok as long as u dont need much power

 

There is an open slot in the fuse box that provides "always on" power. I think it is upper left. Not sure, but the search button will find it for ya. I tapped into that using the add-a-fuse type kit, and ran the power to a aux terminal under the driver's seat, with the switch on the center console between the seats. It would be very simple to run it through the door sills into the rear seat or cargo area. That it probably your best bet. Good luck!

 

Why use a relay system when you can wire a low-current fan setup directly off the remote wire for the amplifier? It isn't 12v Constant, but who cares? Run it off the remote wire and your fans will turn on whenever the amps are on.

 

agreed, thats gonna be the setup

 

What kind of fans are you going to be using?

 

The remote wire will also go to this relay.



It will cause less draw on the remote wire, thus safer overall. The fan and both of my amps will also be wired into the relay.

Yea it looks like I'll end up running it off the empty slot in the fuse box.

And I'll be using a 120mm "silent" computer fan.

 

http://www.newegg.com/Product/Produc...82E16835186008
Arctic Cooling AF12
Super quiet, fluid bearing, no resonating mounts, moves over 50CFM @ only 1500rpm!!!
Current draw=.15A
You could run several of these fans off the remote lead/relay circuit, and still not draw a full Ampere.

 

that 12v powerblock thing off a suburban is a great idea, I'm assuming creating just any type of 12v block off the battery will work. I dont need to hunt for 85 suburbans right?

Gonna use this on my future projects.

 

it would come off any old Chevy truck, burban from the 80s i believe

 

You'll need to run a heavy +12V lead from the battery for the amp, anyway, so just tap off of that with a fuseholder to power the relay and everything downstream from it, with the remote wire running the relay coil...