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Profyaffle

Member Since: 03 Oct 2016
Location: N Yorks
Posts: 527

Ignition live Aux fuse box

Hello,

I want to install an aux fuse box in the battery box. However I want it to be powered only when the ignition is on. It will only have heated seats, heated windscreen and radio eventually.
I am going to fit a 70 amp relay on the +ve wire so what I would like to know is what size cable will be suitable for the ignition live connection which I will feed into the battery box.

Many thanks.

4th Nov 2016 6:44pm

leeds

Member Since: 28 Dec 2009
Location: West Yorkshire
Posts: 8580

Once you go onto larger CSA cable you are looking at 7 -8 amps per mm2.

So for 70 amp the minimum cable size would be 10mm2 Going larger say 16mm2 will give you a decent safety margin..

Blue Sea do a split 12 gang fuse box. One set of 6 can be permanent live another bank of 6 can be iginition live only. Available [url=http://www.4x4overlander.com/product/blue-sea-st-5032-12-way-split-blade-fuse-block/]here[url]

Brendan

4th Nov 2016 6:59pm

Profyaffle

Member Since: 03 Oct 2016
Location: N Yorks
Posts: 527

Thanks Brendan,
I have a larger cable to use from the battery to the relay and then on to the fuse box, it was just the size of cable from the switched ignition to the relay I wasn't sure of, does that make sense ?

I have seen the blue sea fuse box but I have unfortunately already bought just a normal one.

4th Nov 2016 7:04pm

Mo Murphy

Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2223

1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey

You won't need much to operate the relay, less than an amp so you won't need much in the way of wire.
HTH
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey

4th Nov 2016 8:42pm

Profyaffle

Member Since: 03 Oct 2016
Location: N Yorks
Posts: 527

Ok, thanks Mo. I will run a cable in now while I'm doing the cab interior.
Thanks again
Julia

5th Nov 2016 6:29am

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