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Looking for a switched positive for an install


ripped_fear
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Evening all.

 

Looking for some guidance, I'm fitting an under seat sub to the supra, and I have been looking at the wiring diagram (show below) and I have a question looking at the + terminal. In previous installs I have ran a fused + wire directly to the battery, and then you have an additional wire that runs to the Head unit to activate it, this sub doesn't have this.

 

So looking at the pictures I looks like I have to splice into a + from the fuse box? One I'm assuming must be a switch ignition positive to avoid it running down the battery.

 

If this is correct anyone know of an appropriate wire around the passenger foot well area? be nice to keep the wiring minimal so something in this area rather than running all the way to the headunit would be great.

 

Thanks for any help

 

Jake

 

attachment.php?attachmentid=216459&stc=1&d=1484070029

wiring.jpg

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Yellow is permanent, blue / white is switched. There should be a blue / white wire on your head unit look you can connect it to.

 

Either connect yellow to the battery terminal, of if you want to hide It, there's a post in the fuse box you can connect it to.

 

Thanks for confirming that. Is that in the engine bay fuse box? that would be much better to keep it tidy. is it simple enough to conect to? and which terminal?

 

attachment.php?attachmentid=216460&stc=1&d=1484074083

Supra fuse box.jpg

Edited by ripped_fear (see edit history)
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I have a question looking at the + terminal. In previous installs I have ran a fused + wire directly to the battery, and then you have an additional wire that runs to the Head unit to activate it, this sub doesn't have this.

 

It does. from the diagram the yellow is the wire you should connect to the battery.

 

The blue/white would connect to the stereo so the sub only turns on when your stereo is on. They are usually labelled (remote) on the head units.

 

Just take it straight to the battery with a decent terminal so it looks nice. Perhaps running a thicker gauge to a take off fusebox inside the car.

 

Perhaps something like this:

 

image

 

image

 

Or you could take from the post in the fusebox to an internal fusebox for future use.

 

Then you'd also have an easily accessible place if you need more 12+ constants

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