I had asked about wiring a fan to cool a 4-channel amp before, but am a bit confused by what I'm finding.

I have an Alpine 4-channel amp mounted in my toolbox in the trunk. I mounted a boxer fan in the tray above it and extended the tray 3/4 inch using 1/2" x 3/4" wood to allow for air to come into the amp area. I wired the fan to be switched on/off using a 12V/30A automotive relay.

Here's what it looks like:


The electrical connection to the amp is thru 3 wires as you can see in the image. The top (red) is the positive connection from the battery; the bottom (black) is the ground from the battery; and the middle is a "switched" 12V line, which I intend to use to power the relay.

What I expected was that the middle connection would provide 12V only when the RADIO was on, but it turns out it has 12V whenever the CAR is on. I only want the fan to come on only when the RADIO is on. I didn't connect the amp, but wonder if it's possible to have the amp switched on only when the radio is on.

Does this make any sense?

 

What HU are you using? Did you install the amp yourself?

 

[QUOTE]Originally posted by lucid
[B]What HU are you using?

 

Thats what i thought. They tapped a switched source and didn't use a "trigger" device to that opens power to the remote wire when sound is detected - see PAC TR7.

 

What's PAC TR7??

 

www.go2pac.net you'll see it there.

 

OK, I see it; I want it; I can't find anyone who carries it (even the dealers they reference). Do you carry it?