For me, I would butt splice them, and then put water proof heat shrink tubi=
ng over each connection.  Why? Splicing is easy to repair, I don't prefer t=
o solder wire to wire unless its just for a test.  It seems you end up melt=
ing more insulation and still question  if the solder was completely bondin=
g to all the wires.

Also you NEVER want to tin wires that are clamped and crimped.  The reason =
behind this is that over time and temperature fluctuations, they will becom=
e loose and end up causing opens, pulling more current and eventually could=
 be damaged (melt).  I've seen this before.  Putting paste to prevent oxidi=
zing is generally done only with diss-similar metals...ie....bonding Al wir=
e to a copper  stud.  Tin to Tin et al, you shouldn't need that.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Charles Craft
Sent: Monday, April 27, 2015 6:45 PM
To: PIClist
Subject: [EE] Butt splice vs solder

I think I asked this a couple years ago.
Just getting around to the project now. :-) I'm the not so proud owner of a=
 Polaris ATV with a bad wiring harness.

Butt splice or solder to repair broken wires?
If butt splice, tin wires first?
If butt splice, treat wires with "conductive paste to reduce/prevent oxidat=
ion"?

I think last time around someone mentioned there was a mil-spec or aircraft=
 spec that said to use mechanical splices.

thanks
chuckc




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