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wire loom connections
finlay - 6/2/08 at 09:45 AM

hello all

just after some advice

its my first attempt at making up a wiring loom and was wondering

is it ok just to bind/twist 2 cables together and seal with heat shirink ?, this is just to make up a specific length its not for connections etc

cheers

Finlay


tegwin - 6/2/08 at 09:48 AM

Ideally you want as few connections as possible in your wires... Buy stuff that is the right length...

but if you must do connections, twist them together and then solder them, then put the shrink wrap on....

Its worth thinking about what will happen if the cable is put under tension? Will your connector fail?

I always tend to put a stress relief loop on each joint so that if the cable is pulled, the loop expands before the joint is stressed


bonzoronnie - 6/2/08 at 09:53 AM

quote:
Originally posted by tegwin
Ideally you want as few connections as possible in your wires... Buy stuff that is the right length...

but if you must do connections, twist them together and then solder them, then put the shrink wrap on....

Its worth thinking about what will happen if the cable is put under tension? Will your connector fail?

I always tend to put a stress relief loop on each joint so that if the cable is pulled, the loop expands before the joint is stressed




Very sound advice.

A few moments with the solder gun will avoid a lifetime of hunting down electrical problems

Ronnie


jammy_basturd - 6/2/08 at 11:57 AM

Personally I'm not a fan of using solder on a wiring loom, I'd much prefer to use proper automotive crimped connections, and heatshrink over them if need be.


thunderace - 6/2/08 at 12:11 PM

why not buy a loom like the ones from premier looms.

http://www.premierwiring.co.uk/


MikeRJ - 6/2/08 at 12:35 PM

quote:
Originally posted by jammy_basturd
Personally I'm not a fan of using solder on a wiring loom, I'd much prefer to use proper automotive crimped connections, and heatshrink over them if need be.


Crimps are better than soldered joints, but only if the proper crimping tool is used! The cheap crap ones that often come in a kit with assorted crimp are pretty useless.


finlay - 6/2/08 at 12:47 PM

thanks for that

Finlay

quote:
Originally posted by tegwin
Ideally you want as few connections as possible in your wires... Buy stuff that is the right length...

but if you must do connections, twist them together and then solder them, then put the shrink wrap on....

Its worth thinking about what will happen if the cable is put under tension? Will your connector fail?

I always tend to put a stress relief loop on each joint so that if the cable is pulled, the loop expands before the joint is stressed


finlay - 6/2/08 at 12:59 PM

quote:
Originally posted by thunderace
why not buy a loom like the ones from premier looms.

http://www.premierwiring.co.uk/


thanks for the info, just off the phone to them and they are going to supply me with all the wires, phew!! as i was really struggling to find anywhere locally that hold cableing in stock

cheers


tegwin - 6/2/08 at 01:19 PM

For future referance...

These companies can supply you with all the bits you need:

Vehicle wiring products
Rapid electronics
maplin
rs components


RazMan - 6/2/08 at 02:07 PM

There is a school of thought which says that soldering automotive connections is very wrong. The joint becomes very rigid and with constant movement over time, the edges of the soldered joint become brittle and can break. A (proper) crimped joint is flexible and is less likely to break. Just look at all of the cars manufactured and see if ANY of them use soldered joints in their looms.

As already mentioned, the proper crimping tool will cost proper money and if you pay anything less than £30 then the chances are that your crimps will not be up to scratch. The right tool will not only crimp the connection but also form a strain relief in the plastic shroud (a kind of diamond shape) which is the secret to long life looms.

[Edited on 6-2-08 by RazMan]


worX - 6/2/08 at 03:17 PM

Solder and Crimps can be used effectively!

Steve


Confused but excited. - 6/2/08 at 03:39 PM

Never make a joint/connection where you can't get at it easily when the vehicle is finished.


dhutch - 6/2/08 at 06:33 PM

Twisting wires together and taping (or shrinkwraping) them up is asking for trouble at the best of time.
- The prevous owner did that for the sterio in my car (having butchered the loom, rather than paid £3 for a loom adapter) and the whole way home every single on of the speakers was droping in and out as it wished on each bump. Nice.

You can solder bits, it does make a good joint initally, and largly you will get away with it from a vibration point of view if the loom is well supported.
- However, i would use crimp conectors if i was doing it. Or where you want to be able to get it apart. Crimp on ends into choclate block.
- Certainly thats what i did wiring our trailer/trailersocket and whats been done by us on our boat.



Daniel