Best routing for a 12v supply?

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chelrob
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Best routing for a 12v supply?

I want to put a 12v supply in the boot. Was thinking of taking from one of the dash switches, but any views on what is the best way to route it through to the boot compartment?   

SLR No.77
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The only practical way to get the wiring through the the boot is to remove the centre tunnel cover and cable tie the wiring to the chassis tube, the loom running to the rear will already be in there.

Depending on the year of car, you might be able to feed the new wire into the boot via a small gap in the bulkhead, or otherwise drill a hole and use a small grommet to avoid chafing of the wire(s).

Stu.

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SM25T
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If it is a recent build, it may already have a 12V supply cable and connector in the boot.
admaraujo
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I would buy a 4-way 12v supply, get current from ignition and double tape it under the dash.

That was what I did.

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Wrightpayne
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I connected my 12v outlet to the permanently positive side of the FIA switch. Its the only live circuit when the switch is thrown but has a fuse within inches of the connection. This is so I can easily plug my trickle charger into the socket.

As Stu suggested the transmission tunnel is the route to go though I would sleeve the wire for extra protection.

 

Ian

John Vine
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Agree about the tunnel route.

What year and model is the car?  What device(s) do you plan to attach, and at what wattage?  That could have a bearing on where you take the power from.

JV

Golf Juliet Tango
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My 12V outlets are either ignition switched or isolated by the battery isolator.

Stephen

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John Vine
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Looking at the paper-based Assembly Guide that came with my 2008 R400D, the Sigma wiring diagram shows a power socket towards the rear of the car:

Judging by the cable lengths, this could well be located in the rear bulkhead area.  If it's not immediately visible, it might be tied up out of the way under the tunnel cover or below the boot floor.

According to the same Guide, fuse "O" is shown as "10A Power socket".  If there's a fuse fitted there, you probably have the power socket too. 

JV

colindavies56
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there's a pair of 12v spade ends by the offside rear wheel and a pair near the diff.on a 2010 sigma. 

K7 VCT
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My 2014 sigma has a pair of spades in the boot attached to the bulkhead for a power outlet. I have a power outlet in the dash for devices and as its wired and fused direct to the battery I use it for my ctek charger. I also have a motorcycle dual USB outlet by the passenger knee trim panel, its water proof.

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chelrob
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Thanks for the suggestions everyone. The car is a 2008 Sigma and I wanted the supply for a video camera, so not a high current.

 Anyway following the various inputs, I have had a more thorough look underneath and there is indeed a spare terminal hidden away up behind the rear suspension.. However, it is permanently live rather than ignition switched which is what I need. So looks like i need to run a new cable, but was worth checking... Thanks