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Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2770

Wiring a blue sea fuse box properly.

So I'm keeping this defender forever, I've decided, and as such I'm turning an electrical corner. I want to go back and sure up a few of the electrical items I've fitted, this time using a proper auxiliary fuse box etc. (I've been known to use scotch locks, lots of tape and twisting wire ends together in the past haha)

So I've got a blue sea fuse box which I want to fit properly in the battery box. Can someone tell me (or point me in the direction of) how i should be wiring it into the battery please?

ie:
-fuse/no fuse btw battery and fuse box? (if so what size?)
-thickness of wire?
-how to connect to the terminals best?

want this part to be "bulletproof" so I'm confident adding on whatever else in the future...

cheers in advance Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

11th Dec 2014 6:35pm

redzob

Member Since: 16 Jul 2014
Location: St. Peter Port
Posts: 137

2015 Defender 90 Puma 2.2 XS CSW Corris Grey

I did the same and found that searching for "megafuse" on this forum was a pretty good start! Defender Puma 2.2 XS 90
Vespa GTS 300
Way too many racing bikes.

11th Dec 2014 6:54pm

munch90

Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

fuse/no fuse btw battery and fuse box? (if so what size?) -- depends on what your running on it , and how short and protected the wire is to the fuse box , example if you fitting the fusebox along away away from the battery and had a long wire that could rub through then yes fuse the feed , if the fuse box is next to battery and good protected wire then possibly not

-thickness of wire? depends on what your running on it and might add later , and what might be on at the same time and how long etc

on the positive terminal there is a m8 threaded hole to put positive feed for fuse box on with a ring terminal , only use a short bolt as the threaded part isn't very thick

negs are you running back to battery box or picking earth from where the thing is you fit eg off body/chassis etc
if your going back to battery then I would cut the neg terminal off the fit a ring terminal to the earth wire (needs to be heavy duty and good crimp , poss not diy job ) and fit a neg terminal with a stud then bolt main earth to it and a earth wire for a bus bar terminal block for earths

11th Dec 2014 6:56pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Depends as Munch stated what you're intending to run off it and it's maximum current capacity. I connected mine (also Blue Sea which has I believe a 60 amp total rating) directly to the vehicle 100 amp mega fuse. I then subsequently placed a 60 amp fuse in line and ran that to the input of the fusebox on the basis that the smaller would naturally rupture first in the event of supply cable failure. If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

11th Dec 2014 7:33pm

leeds

Member Since: 28 Dec 2009
Location: West Yorkshire
Posts: 8582

Rule of thumb for larger cables 7-8amps/mm2

Blue Sea fuse boxes are rated at maximum of 100 amps per bank of 6 fuses so that is the largest fuse between battery and fuse box.

If using a 12 gang fuse box spread the load as evenly as possible between the two banks of fuses. You do not want 6 x 30 amp fuses on one bank and 6 x 1 amp fuses on the other bank.

HTH

Brendan

11th Dec 2014 7:35pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

David if I can help with any bits 'n' bobs you may need just drop me a 'pm.'

Couple of pictures....Suffering from mild OCD and having only one battery I placed the lot in an IP67 rated enclosure too with waterproof glands. I also ran an extra multicore cable from driver's side to passenger seatbox for any future additions as the cable would already be there.

Click image to enlarge

Click image to enlarge If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

11th Dec 2014 7:36pm

Blacktt600

Member Since: 30 Nov 2013
Location: Leeds
Posts: 125

2008 Defender 110 Puma 2.4 XS CSW Cairns Blue

I chopped up an old pair of cheep jump leads for the supply and ran it through a 50amp fuse, the type that audio buffs use. Obviously up the fuse rating if needed.

11th Dec 2014 7:52pm

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2770

thanks so the help everyone so far! some good stuff to think about/read

K9F- may drop you a PM in the coming days or hours!

leeds- thanks for that info, v helpful. An opportunity for you to sell a 'wiring kit' for the blue sea fuse boxes perhaps? I'm sure theres a few out there who are capable of wiring the odd bit, but would be happy to buy a ready-made kit for fitting the box to the battery itself? just a thought... Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

11th Dec 2014 8:17pm

mikeh501

Member Since: 07 Jan 2013
Location: United Kingdom
Posts: 1142

Hi david, check out vehicle wiring products website. All the stuff you need is there.

I'm probably close to you in staff @ m6 j16 and have a bluesea and your welcome to come have a look how mine is fitted. Would happily give you a hand.

11th Dec 2014 9:15pm

bpman

Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

David

You have a PM

cheers
Steve

11th Dec 2014 10:17pm

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2770

mike, thanks for that, having a look on their site - very good aren't they.

Should get most of what i need on there.

Thanks for your offer too, if i get stuck ill drop you a PM

Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

11th Dec 2014 10:46pm

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2770

quick question that I'm sorry i could find the answer to!

buying a few bits, what size/dia. 'hole' do i need in the connector (the polo shaped one) which attaches to the main positive on the blue sea fuse box? i.e. the incoming +ve feed from the battery? Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

11th Dec 2014 10:48pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20626

I would recommend VWP too, especially for multiple bits and pieces.
The prices are very competitive and good quality, for smaller Canute cable I'd recommend thinwall too.

Mal's photo example is great, always screams to me that you can tell a sparky co,pelted it too.
MK junction box and all.

11th Dec 2014 10:52pm

mikeh501

Member Since: 07 Jan 2013
Location: United Kingdom
Posts: 1142

this might help you.

Click image to enlarge Electrical Setup v3 by mikeh501, on Flickr

12th Dec 2014 8:49am

HansT

Member Since: 25 Dec 2012
Location: Mariefred
Posts: 173

This is my setup with two batteries, separation relay and mega fuse box under driver seat (LHD) and BlueSea fuse box under passenger seat. Must remember to fit terminal cover on battery

Click image to enlarge

12th Dec 2014 8:42pm

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