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Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

2009 Defender 90 Puma 2.4 CSW Indus Silver

Positive battery terminal issues

I've just recently picked up a couple of Optima batteries (RT starter & YT auxillary) together with a Gwyn Lewis battery tray.

As I measuring everything out this morning and seeing what the best orientation is, I noticed that as per the picture, the terminal connected to the mega fuse is a couple of cm too short to fit onto the RT terminal.

Is there a longer positive terminal available, or, failing that, are there any suggestions as to the best manner in which to connect the terminal/cable?

Click image to enlarge

5th Nov 2022 9:42am

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Is there enough clearance to turn it upside down? Failing that, you could fit a standard terminal to your cable and mount a replacement mega fuse remotely. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

5th Nov 2022 9:49am

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

No, there isn't enough room to invert the connector.

I was thinking that if I cut off the connector along the yellow line, I could then get a normal terminal and connect to each other with a small section of 50mm cable.

5th Nov 2022 10:05am

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

I see that there is a thread on the same issue here.

https://www.defender2.net/forum/post861572.html

5th Nov 2022 10:09am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17372

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The megafuse is a recent addition (introduced with the Puma) and I suspect was only fitted for type approval or regulatory reasons. Its sole purpose, as far as I am aware, is to lessen very slightly the risk of fire in the event that you have a hard frontal collision which causes the starter (and possibly alternator, I can't recall offhand if this is also connected via the MF, I think not) cabling to short to ground.

It is however highly likely that cable damage could occur which turns your vehicle into a fireball long before the MF blows and personally I think the MF is of very questionable benefit. If you are seriously worried about fireballs, fit a manual isolator (and do your best to remain conscious and cable during a serious accident). You could combine an isolator with an inertia switch if you are really worried.

Remember that deleting the MF makes you no less safe than you would be in an earlier Defender anyway.

5th Nov 2022 10:33am

LR Nuts

Member Since: 10 Aug 2022
Location: UK
Posts: 1110

Thug - this is the time, when Land Rover turns every driver into an engineer.

I would build an 'extension post and cap', solved without changing any standard part.

5th Nov 2022 10:36am

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

Thanks guys.

5th Nov 2022 11:40am

SteveG

Member Since: 29 Nov 2011
Location: Norfolk
Posts: 659

I personally would fit a manual isolator switch to the front of your seat box. You could then remove the mega fuse and connect your cable to switch and insert new 50 mm tail to switch from battery. That way you can easily isolate power to vehicle that’s within easy reach of the driver seat.

Cheers

5th Nov 2022 4:40pm

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

Thanks, that’s a good idea.

5th Nov 2022 5:12pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

2012 Defender 90 Puma 2.2 CSW Santorini Black

Something like this to offset the terminal, but current rating looks a bit low.

https://www.amazon.com/dp/B0B8J1F73B/ref=s...9kZXRhaWwy 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

5th Nov 2022 5:46pm

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

I’ll look at a Victron Battery Switch.

Has a continuous rating of 275A, one minute at 450A and a cranking rating at 1200A.

https://www.victronenergy.com/battery-isol...tch-on-off

5th Nov 2022 6:23pm

DuncanS

Member Since: 06 Dec 2013
Location: Cumbria
Posts: 299

2008 Defender 110 Puma 2.4 USW Santorini Black

Just take the megafuse out of the holder down the side, reterminate and put it in a new holder, coupled with a short link lead. I've done this with my batteries. If you need more info just let me know. North Cumbria Search and Rescue - Team Leader

5th Nov 2022 6:37pm

Thug

Member Since: 02 Aug 2022
Location: Johannesburg
Posts: 20

Thanks all for the different suggestions.

6th Nov 2022 7:05am

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