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stooby do

Member Since: 14 Mar 2015
Location: St. Helens
Posts: 69

Running accessories from Alternator

Long post, please bare with me...

I need a bit of advice with regards wiring accessories from the Alternator.

I recently fitted Wipac crystals and the Boomslang loom to go with them. After reading many posts on the subject I took the main feed for the loom from the alternator on my Td5. I have also wired in a Stebel Nautlius horn and to tidy things up I put in an aux fuse box in the engine bay. The horn and lights are fed from the fusebox and the fusebox main feed is from the alternator.
I now want to wire in 2x130W KC Daylighter spots. I had planned to take their main feed from the aux fuse box but I am concerned about the load I am putting on the alternator and importantly the LR wiring to it from the battery.

Is this safe or should I run in a new feed from the battery to the engine bay fuse box?
If I need a new feed, how do you do this as the aux box is rated to 100amps which would require a pretty thick cable from the battery (with a 100A inline fuse of course) over a fairly long distance. Highest current cable I have seen sold by the metre seem to only be rated to 63A.

14th Oct 2015 1:36pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

Cable doesn't have to be stupid money: http://www.beal.org.uk/automotive/automoti...00146.html
But would be a bit unnecessary. When the engine is running, everything is powered from the alternator anyway. So putting additional loads at the alternator instead of at the battery actually decreases the load on the battery-alternator cabling.

14th Oct 2015 5:26pm

VeeTee

Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512

260W is approx. 22A, most alternators are rated 70A or 100A, so the alternator will cope. Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite

14th Oct 2015 5:41pm

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

Td5 is 120A iirc.
Puma 150A

14th Oct 2015 5:51pm

VeeTee

Member Since: 06 Mar 2011
Location: Somewhere
Posts: 1512

Ah well, those modern engines...

Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold)
1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold)
1975 Series III 88 V6, Light Green (sadly sold)
1996 Defender 110 CSW 300 Tdi, Epsom Green (sold)
2000 Freelander 1 TD4 3-drs, Silver (sold)
2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold)

MySite

14th Oct 2015 5:52pm

stooby do

Member Since: 14 Mar 2015
Location: St. Helens
Posts: 69

Thanks for the replies everyone, will leave aux fuse box fed from the alternator.

15th Oct 2015 8:30am

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