↓ Advertise on Defender2 ↓

Home > In Car Electronics > Fusing your starting circuit on a defender.
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
rodspink



Member Since: 12 Apr 2015
Location: Aberdeenshire
Posts: 187

Scotland 
Fusing your starting circuit on a defender.
Has anyone fused there main power from battery to starter. Iv found a fuse box for a mega fuse and 4 midi fuses which would enable me to fuse the main power to starter, ignition and alternator circuits. Any issues to doing this and what sort of fuse size did you run to allow for the large inrush currents.

Thanks

Rod
Post #448232 22nd Aug 2015 7:39am
View user's profile Send private message View poster's gallery Reply with quote
LRmud



Member Since: 22 Oct 2014
Location: IV12 Highland
Posts: 198

Scotland 1989 Defender 90 300 Tdi HT Baltic Blue
Played with a lot of electrics on the Landy but not done that. Not needed to really.
Is this something you need? Confused --------------------------------------------------------------------------------------------------
1989 Defender 90
Toyota Aygo & Honda FR-V
Post #448345 22nd Aug 2015 7:00pm
View user's profile Send private message View poster's gallery Reply with quote
blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16947

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
1) Why do you think you need to do this?

2) If the fuse blew with the engine running the alternator will probably self destruct.

It introduces another component and potential failure where one really isn't needed.
Post #448359 22nd Aug 2015 8:26pm
View user's profile Send private message View poster's gallery Reply with quote
ickle



Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1730

France 2008 Defender 110 Puma 2.4 CSW Alpine White
I think there's one there already, part of the battery connector assembly?

Keith
Post #448361 22nd Aug 2015 8:37pm
View user's profile Send private message View poster's gallery Reply with quote
rodspink



Member Since: 12 Apr 2015
Location: Aberdeenshire
Posts: 187

Scotland 
Hi folks.
Definitely not fused at the moment.
And have been considerding doing this, main reason is that the 90 is for off roading only and i have concerns about damage occuring to the cableduring off roading. The car is isolated but I have seen these isolators fail.
Also with the car being a very early 90 there is no fusing to the likes of the ignition and glow plugs. This is something else I intend to sort out but was looking for opinions on fusing the main cable to. So all thoughts welcomed.

thanks for the replys.

Rod
Post #448407 23rd Aug 2015 7:00am
View user's profile Send private message View poster's gallery Reply with quote
blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16947

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Protect the cable. Fit a good manual isolator switch adjacent to the battery (with the appropriate circuitry to protect the alternator) in the same way as you would on a competition vehicle.
Post #448419 23rd Aug 2015 8:58am
View user's profile Send private message View poster's gallery Reply with quote
ickle



Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1730

France 2008 Defender 110 Puma 2.4 CSW Alpine White
There's definitely one on my Puma & its listed on Microcat, so I assume you're running an earlier truck, for off road I'd agree with the above, battery isolator through the front of the seat box is the way forward.

Keith
Post #448449 23rd Aug 2015 1:53pm
View user's profile Send private message View poster's gallery Reply with quote
rodspink



Member Since: 12 Apr 2015
Location: Aberdeenshire
Posts: 187

Scotland 
Thanks for the advice gents. Much appreciated.
Keith yeah she is a 1989 90 so a fair age. Interesting that there is one in the puma.I will check that out. As Iown one as my tiw vehicle.

Cheers again.

Rod
Post #448461 23rd Aug 2015 3:39pm
View user's profile Send private message View poster's gallery Reply with quote
blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16947

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
There is indeed a megafuse on the Puma but in reality it is not going to do much good - it will probably blow if there is a dead short to ground after a serious accident, but the current needed to blow it is well in excess of the current needed to incinerate the vehicle. I think it is only there due to an EU requirement. Don't rely on it actually doing anything useful under normal fault conditions.
Post #448507 23rd Aug 2015 6:46pm
View user's profile Send private message View poster's gallery Reply with quote
rodspink



Member Since: 12 Apr 2015
Location: Aberdeenshire
Posts: 187

Scotland 
Hi Blackwolf.

Thus is the circumstances that I was looking to protect from. As you say highly unlikely and the isolator should be suitable. I just like to err on the side of caution.

Cheers again.

Rod
Post #448769 24th Aug 2015 6:35pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT + 1 Hour

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums