Haynes Forums - Make my own loom

Haynes Forums (http://www.haynes.co.uk/forums/index.php)

- Electrics (http://www.haynes.co.uk/forums/forumdisplay.php?f=7)

- - Make my own loom (http://www.haynes.co.uk/forums/showthread.php?t=3513)

Here is the first hit from Google after typing ’10 Core Cable’

OK,

I should apologise for trying to be smart,

That link is for computer cable; however Tow Equipe do a 13 core cable for the new trailer wiring, that should work.

Quote:

Originally Posted by AshG (Post 29643)

davey. you will need 10 core if you plan to fit a fuel sender and fuel pump. ;)

this is the set-up i did on my car it will hopefully highlight what you need on the car light/service wise. the engine loom and ignition switch gear are separate looms but have to interconnect to some degree for switched live etc. etc.

Rear wire requirements
1. Tail Lights
2. RH Ind
3. LH Ind
4. Stop Lights
5. Handbrake Light (also needs extending to front brake reservoir for fluid level warning)
6. Fog
7. Reverse
8. Fuel sender
9. Fuel Pump
10. spare or earth if you have fibre glass tub

Front Wire requirements

1&2. Dipped Beam (requires a wire for each bulb due to high current load)
3&4. Main Beam (requires a wire for each bulb due to high current load)
5. Sidelights
6. RH Ind
7. LH Ind
8. Horn
9. Rad Fan
10. Brake Light switch

another couple of little things you will need to watch out for when making your own loom

1. sidelights must work when ignition is off
2. hazards must work when ignition is off
3 full beam can only be used when the dipped beam is on! but not when sidelights are on, or if all lights are off. the exception to this is full beam flash must work in all on off scenarios other than ignition off.

when it comes to relays you only need to use them when the switch gear e.g sierra stalks/savage switches etc cant take the current load of the device. for my car i have used relays for dipped beam full beam/ hazards for the flasher and fuel pump(switched on and off by engine ecu in my case).

hope all the above helps. making your own loom for the first timer can seem very daunting but its very rewarding when it all works. The plus side is if you ever have a problem you know the system inside out so it should be easy to fix.

hi ashg, thats really helpful, i just wondered are you saying that you didnt use relays for other things such as the horn, or in situations where the switch can hadle the current? Also, the extra points you mentioned at the end, are they taken care of in the original sierra wiring, as i have no recollection of what the sierra light system was like, if so, ill just stick to the sierra wiring diagrams then.

Also one other thing, whats the sort of current that the wire will need to manage for the full beam and dipped headlights? Thanks

gee man if you wire up the sierra column correctly then it will all work as described above.

you can get the 10 core cable from here

http://www.vehicle-wiring-products.e...e/homepage.php

ok thats an easy one
add upp the wattage of the bulbs that the wire /switch is feeding and
divide by 12 that will give you the amperage drawn for eg..
2 x55w headlamp bulbs and 2 x5w rears and 1x3w no plate is total 123watts
so 123w divided by 12 is a tiny bit over 10 amps
so you will need cable and switching to carry 10 amps comfortably
probably you will find 17 amp cable is an industry standard ( blue lucas terminals ) and a 15 amp fuse would be adequate for this circuit..
hope that helps
cheers les g

little science question for you geeman. the bulbs are 55watt you have about 13ish volts you should be able to work out the amps required from that :D

aargh les you ruined it :D

the main reason i specified a wire per bulb is due to the reduced thermal efficiency of multi core cable. where they are all bundled together tightly it makes it harder for each wire to dissipate heat under high load.

its like Cornwall Ash
Virgins Are Rare
see i was listening .
that was on the days i bothered to go to school
cheers les g

and if i was any good with a PC.
i would do the little triangle thingy
cheers les g

the 10 core cable from vwp has 9 16amp cores and one thicker 25amp core