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Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 680

What is the puma era alternator/starter motor cable size?

Seems like a stupid question - just go measure it right?

What I need is the copper inside the cable - cross sectional area/diameter, so i can get the right cable size matched in the other side of a mega fuse i'm installing to replace the awful one that's fitted to the battery terminal as standard. Going in as part of a dual battery install.

Does anyone have access to a wiring diagram that lists cable sizes, a starter motor pulls 1000a at cranking short term, but the cable isn't sized according to that current rating or it would be in excess of 70mm2 cable. It's not. It's closer to 35mm2.

I don't want to cut the cable and reterminate whats already a good termination done by the wiring supplier of JLR at build. And that's the only way to tell on the vehicle without baring out the copper and stripping the insulation - which isn't really desirable either

There you are. My lock-in saturday night pondering question!

4th Apr 2020 7:51pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8009

2011 Defender 110 Puma 2.4 USW Stornoway Grey

35mm2 will do the job. Not sure what std lr is, I would guess at 35. It's not 70mm2. We run 70 and 90mm2 for heavy winch current applications. Cheers

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

4th Apr 2020 8:02pm

Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 680

Thanks, would certainly be good if it was 35mm2 as that's what i've got in the shed and i'd rather not buy another reel. Not cheap stuff!! The overall diameter looks about 35 ish.

Trouble is you can't just go " well what carries 1000a then as that's peak current " as it's not sized based on continuous load.

My 8274 is on 35mm cable too incidentally. Have you ever had issues with running 35 or just went for 70/90 out of speccing for continuous load? 35's all i had at the time again - could switch it over just wondering if you'd ever run it and seen an issue. It's only got a standard motor on it.

Click image to enlarge

4th Apr 2020 8:08pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6604

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

It’s 40.0mm2

Click image to enlarge

1988 90 Td5 NAS soft top

2015 D90 XS SW

5th Apr 2020 8:50am

diduan

Member Since: 13 Oct 2016
Location: Central Balkan
Posts: 260

Interesting, great info! I was planning to mount a battery cut off switch soon and bought 35mm2 cable for the job...now I will have to reconsider my cable choice. Defender 110 SW MY2011 2.4tdci decat, no EGR
Jeep Wrangler YJ 1990 4.0. Front 78' Dana 60, Rear CUCV 14 bolt

5th Apr 2020 9:29am

macfrank

Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1070

2015 Defender 110 Puma 2.2 SW Keswick Green

Martin wrote:
It’s 40.0mm2

Click image to enlarge

Hi Martin,
that's interesting. In the 2012 and 2015 wiring diagrams I have, it's 50mm^2.

5th Apr 2020 9:46am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8009

35mm2 will work no problem. I have 4 pumas wired with it.

Ref the 70/90mm2 we used to run competition vehicles. With a std motor bow1 size, 35mm will cope. When we moved to bow 2, then bow3s, then twin motor bow3s the current draw was huge hence bigger cable. Twin bow3s (9hp each) was originally 4 x 1000cca, 110ah batts to cope with demand, that's with two alternates . In end went 24v through 12v so current was reduced, line speed increased and motors saw a good 18 to 22v under load, which is far healthier for them than 9v!

Edited to add we were prototyping for goodwinch for 12 years or so. Cheers

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

5th Apr 2020 9:42pm

dorsetsmith

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

Martin wrote:
It’s 40.0mm2

Click image to enlarge

alternator wire 25.0 mm2 for 2.4 and 2.2

6th Apr 2020 7:52am

Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 680

Thank you all. Really appreciate the help. Love this community!

Where do the wiring diagrams come from, anywhere I can download a full vehicle one from?

6th Apr 2020 8:42am

dorsetsmith

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

2.4 or 2.2

6th Apr 2020 8:45am

Matt110

Member Since: 29 Jun 2014
Location: UK
Posts: 680

2.2 and TD5 if possible?

6th Apr 2020 2:31pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6604

300 Tdi: 25mm²
Td5: 40mm²
2.4 Puma: 40mm²
2.2 Puma: 50mm²

1988 90 Td5 NAS soft top

2015 D90 XS SW

6th Apr 2020 2:38pm

diduan

Member Since: 13 Oct 2016
Location: Central Balkan
Posts: 260

I wonder if there was a reason for going from 40mm2 to 50mm2 in 2.2tdci? Defender 110 SW MY2011 2.4tdci decat, no EGR
Jeep Wrangler YJ 1990 4.0. Front 78' Dana 60, Rear CUCV 14 bolt

6th Apr 2020 3:20pm

dorsetsmith

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

Matt110 wrote:
2.2 and TD5 if possible?

2.2 LHD

https://1drv.ms/b/s!AtZSoWFHDgnGlB8iSFfsA9JN_EFj?e=382XRD

TD5 2002

https://1drv.ms/b/s!AtZSoWFHDgnGlGJ6dB05NJC8QFj9?e=gLisej

amendments TD5 see below
https://1drv.ms/b/s!AtZSoWFHDgnGlGMObrLrqqEgHyTs?e=OHjVRl

thanks tio martin

6th Apr 2020 4:00pm

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