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2010Blackdefender90

Member Since: 07 Jan 2018
Location: London
Posts: 562

2011 Defender 90 Puma 2.4 SVX Station Wagon Santorini Black

Puma mega fuse replacement

Has anyone removed their mega fuse - positive battery terminal and replaced it with an in line fuse holder with said mega fuse and changed the positive terminal to a “normal” positive terminal

I’m putting in a dual battery set up but need to move / replace the positive battery terminal and the current 90 deg angle mega fuse terminal set up won’t reach or fit.

I’ve seen pictures of dual battery set-ups in pumas on here, with different starter battery positive terminals, so someone has done it and knows the answer

Thanks

14th Oct 2020 8:56am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8030

2011 Defender 110 Puma 2.4 USW Stornoway Grey

I have taken the fuse out completely. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

14th Oct 2020 5:59pm

2010Blackdefender90

Member Since: 07 Jan 2018
Location: London
Posts: 562

Do you know why it’s there anyway?

14th Oct 2020 6:06pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

In cace short cct or over load to help prevent fire as the starter cables is only rated for shore term fault current before the cable
insulation becomes damage and expose the copper conductor

with short cct or over load the copper conductor will heat up

The only trouble with thermal protection devices i.e. mega fuse 400 to 500 amp have slow reaction time to cop with current in starting the engine

Last edited by dorsetsmith on 15th Oct 2020 8:32am. Edited 2 times in total

14th Oct 2020 6:18pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8030

Yep well aware. Having never seen the need for it prior and my usage/maint I didnt see need for it so removed it from my 2010 vehicle in 2010. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

Last edited by jst on 15th Oct 2020 5:43am. Edited 1 time in total

14th Oct 2020 6:27pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

No reason why you can't put the mega fuse in a fuse holder mounted to the side of the seat box, with suitable cable in and out.

e.g. https://cpc.farnell.com/littelfuse/0298100...dp/FF02698

You *could* remove the fuse (it didn't exist pre-Puma) however it's not a bad thing to have in place in case of a fault with the starter/alternator or wiring to them. LR wouldn't have spent money on it for no reason...

1988 90 Td5 NAS soft top

2015 D90 XS SW

14th Oct 2020 8:52pm

2010Blackdefender90

Member Since: 07 Jan 2018
Location: London
Posts: 562

Thanks.

14th Oct 2020 9:02pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17384

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Just remember that you can easily turn your Defender into a fireball electrically long before the megafuse blows. You really don't need a large current for a blaze.

14th Oct 2020 9:49pm

2010Blackdefender90

Member Since: 07 Jan 2018
Location: London
Posts: 562

Methodical work, double check everything, correct cabling size and crimping, heat shrink. Works every time for me.

Oh you mean like this....

15th Oct 2020 6:59am

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