+12v in the boot for sub

Supervinnie40 · 23rd January 2014, 19:53

Hi guys,

Since I'm doing some stuff to the car I decided to prepare some wiring for the future audio. I already made some wires for the reverse camera (taking the 12v from the reverse light), and I'm gonna pull some wires through the car tomorrow for the audio.

But the amplifier needs a 12v connection.
Any tips?

Is there already a switched 12v in the boot that I can use to power the amplifier? Do I need to pull a new wire from the front to the back? Can I ground the sub at the grounding point in the boot? (just next to the cd changer) or do you recommend connecting straight to the battery?
Any advise is always welcome.

Mischief · 23rd January 2014, 20:23

Usually an amp has a +12v and a remote wire for +12v switched, I hook the +12v to the battery direct with inline fuse and the switched +12v to the switched power on the back of the stereo, a lot of modern stereo's have a remote wire on them usually it's blue.

Supervinnie40 · 23rd January 2014, 20:31

Thanks Mischief. I know how to connect and install it. I'm just not sure what the best option would be to power the amp.
Connecting it directly to the batt, or try to find a 12v wire somewhere in the boot and steal some voltage from that wire.

Often enough you can just connect the - (ground) somewhere in the boot. Most say it's recommended to keep the ground as short as possible.
There is a gathering spot for several grounds in the boot, next to the cd changer. But I don't want my amp to upset any other electronics. So I'm wondering if it will have any negative effects if I connect the ground from the amp to the spot in the boot.

persuer · 23rd January 2014, 20:46

I used the 50Amp wire behind the glove box that the tow bar electrics are wired from then grounded it next to the sat nav in the boot.

Supervinnie40 · 23rd January 2014, 20:49

Quote:

Originally Posted by persuer

I used the 50Amp wire behind the glove box that the tow bar electrics are wired from then grounded it next to the sat nav in the boot.

Can you expand on that 50amp tow bar wire?
I don't have a towbar and I'm not planning on installing one. Does this wire run all the way down to the boot? What color? How can I check if I have it?

persuer · 23rd January 2014, 20:53

Yes if you remove the glove box, look to the left of the cavity there is a 3 way connector behind the passenger fuse panel with a Orange/Slate, Light Green/Pink & Green cables.

Orange/Slate is the main power feed.

Supervinnie40 · 23rd January 2014, 20:55

Do you happen to know if this wire runs all the way to the boot? It'll safe me having to pull a new wire all the way through the car...

persuer · 23rd January 2014, 21:01

I just got the vibe kit from Halfords and fused it there and ran the live and amp switch wire to the boot.

Jakg · 23rd January 2014, 21:06

You really really really want to run a new cable from the battery.

Like really really.

Mischief · 23rd January 2014, 21:07

Quote:

Originally Posted by Supervinnie40

Thanks Mischief. I know how to connect and install it. I'm just not sure what the best option would be to power the amp.
Connecting it directly to the batt, or try to find a 12v wire somewhere in the boot and steal some voltage from that wire.

Often enough you can just connect the - (ground) somewhere in the boot. Most say it's recommended to keep the ground as short as possible.
There is a gathering spot for several grounds in the boot, next to the cd changer. But I don't want my amp to upset any other electronics. So I'm wondering if it will have any negative effects if I connect the ground from the amp to the spot in the boot.

Apologies I read the first post wrong

I was told that an amp draws a lot of power so was best to go direct from the battery, but as persuer has posted you could use the towbar wire should be thick enough.

23rd January 2014, 19:53	#1
Supervinnie40 I really should get out more....... Rover 75 1.8 Club Join Date: Dec 2013 Location: Tilburg (Netherland) Posts: 2,615 Thanks: 572 Thanked 336 Times in 247 Posts	+12v in the boot for sub Hi guys, Since I'm doing some stuff to the car I decided to prepare some wiring for the future audio. I already made some wires for the reverse camera (taking the 12v from the reverse light), and I'm gonna pull some wires through the car tomorrow for the audio. But the amplifier needs a 12v connection. Any tips? Is there already a switched 12v in the boot that I can use to power the amplifier? Do I need to pull a new wire from the front to the back? Can I ground the sub at the grounding point in the boot? (just next to the cd changer) or do you recommend connecting straight to the battery? Any advise is always welcome. __________________ Proud owner of the Dutch "Golden 75". A much loved Gold White Metallic Rover 75 1.8 na from 2000.

23rd January 2014, 20:23	#2
Mischief I really should get out more....... Rover 75 Join Date: Jul 2012 Location: Willenhall Posts: 2,897 Thanks: 181 Thanked 340 Times in 264 Posts	Usually an amp has a +12v and a remote wire for +12v switched, I hook the +12v to the battery direct with inline fuse and the switched +12v to the switched power on the back of the stereo, a lot of modern stereo's have a remote wire on them usually it's blue. __________________ Regards John [SIGPIC][/SIGPIC] My 75's General Information: This vehicle was the 49,501st 75 to run off the production line, out of 112,381 This vehicle was the 1st 75 1.8 T Club SE to be made out of 3,980 This vehicle was the 1st 75 in Celestial (Special Metallic) (code: IAI) to be made out of 19 Celestial (Special Metallic) 75s

23rd January 2014, 20:31	#3
Supervinnie40 I really should get out more....... Rover 75 1.8 Club Join Date: Dec 2013 Location: Tilburg (Netherland) Posts: 2,615 Thanks: 572 Thanked 336 Times in 247 Posts	Thanks Mischief. I know how to connect and install it. I'm just not sure what the best option would be to power the amp. Connecting it directly to the batt, or try to find a 12v wire somewhere in the boot and steal some voltage from that wire. Often enough you can just connect the - (ground) somewhere in the boot. Most say it's recommended to keep the ground as short as possible. There is a gathering spot for several grounds in the boot, next to the cd changer. But I don't want my amp to upset any other electronics. So I'm wondering if it will have any negative effects if I connect the ground from the amp to the spot in the boot. __________________ Proud owner of the Dutch "Golden 75". A much loved Gold White Metallic Rover 75 1.8 na from 2000.

23rd January 2014, 20:46	#4
persuer Posted a thing or two Rover 75 Contemporary SE CDTI Join Date: Sep 2010 Location: Coseley Posts: 1,053 Thanks: 165 Thanked 193 Times in 145 Posts	I used the 50Amp wire behind the glove box that the tow bar electrics are wired from then grounded it next to the sat nav in the boot. __________________ http://i1245.photobucket.com/albums/...ps3c920ec3.png http://www.midlandsnanomeets.co.uk/ You can lead a fool to wisdom but you can't make him think. Last edited by persuer; 23rd January 2014 at 20:55..

23rd January 2014, 20:53	#6
persuer Posted a thing or two Rover 75 Contemporary SE CDTI Join Date: Sep 2010 Location: Coseley Posts: 1,053 Thanks: 165 Thanked 193 Times in 145 Posts	Yes if you remove the glove box, look to the left of the cavity there is a 3 way connector behind the passenger fuse panel with a Orange/Slate, Light Green/Pink & Green cables. Orange/Slate is the main power feed. __________________ http://i1245.photobucket.com/albums/...ps3c920ec3.png http://www.midlandsnanomeets.co.uk/ You can lead a fool to wisdom but you can't make him think.

23rd January 2014, 20:55	#7
Supervinnie40 I really should get out more....... Rover 75 1.8 Club Join Date: Dec 2013 Location: Tilburg (Netherland) Posts: 2,615 Thanks: 572 Thanked 336 Times in 247 Posts	Do you happen to know if this wire runs all the way to the boot? It'll safe me having to pull a new wire all the way through the car... __________________ Proud owner of the Dutch "Golden 75". A much loved Gold White Metallic Rover 75 1.8 na from 2000.

23rd January 2014, 21:01	#8
persuer Posted a thing or two Rover 75 Contemporary SE CDTI Join Date: Sep 2010 Location: Coseley Posts: 1,053 Thanks: 165 Thanked 193 Times in 145 Posts	I just got the vibe kit from Halfords and fused it there and ran the live and amp switch wire to the boot. __________________ http://i1245.photobucket.com/albums/...ps3c920ec3.png http://www.midlandsnanomeets.co.uk/ You can lead a fool to wisdom but you can't make him think.

23rd January 2014, 21:06	#9
Jakg This is my second home N/A Join Date: Feb 2010 Location: Suffolk Posts: 6,867 Thanks: 0 Thanked 397 Times in 302 Posts	You really really really want to run a new cable from the battery. Like really really.