Strip back the wires about 2cm (this'll give you an idea how badly they're damaged), clean them up with a knife or something if they're corroded, overlap them, twist them together and solder. You might have to be patient with the soldering iron if it's weeny.
I spend all day looking for my soldering iron, only upon finding it for it not to work anymore
So I went out and bought some higher rated (35 amp) chocolate blocks, would these be ok, if I wrapped them up well afterwards with insulating tape? Or would it be better to twist the wires together with plenty insulating tape around?
If you can get some bootlace ferrules the right size, the chocolate blocks'll be OK.
Failing that, if the blocks are big enough, hold the wires side-by-side with the stripped ends parallel, twist together thoroughly then push into the blocks from the same end so yo're only relying on them to clamp the twisted conductors together, rather than carry the current between them.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
I would have thought you could solder & heatshrink that lot Gaz, it'll make your life easier if you flux up the wires & tin them first, don't forget to slide the heat shrink on before you solder the wires together!
If you can twist the wires together first like Steve suggested it'll be a better joint but you'll need a big soldering iron!
1996 406 1.8LX Got a bad case of hydro lock!
1996 406 Executive 2.0 Turbo XU10J2TE No longer hangin' on in there
1997 Honda CB500V
2003 Volvo V40 1.8 GDi SE killed by a nutter in a beemer 5 series
2008 Mondeo 2.0 TDCi Titanium X
"Always look on the bright side of life, dedo, dedo dedodedo"
Either that or a porcelain connector block, something like this.
1996 406 1.8LX Got a bad case of hydro lock!
1996 406 Executive 2.0 Turbo XU10J2TE No longer hangin' on in there
1997 Honda CB500V
2003 Volvo V40 1.8 GDi SE killed by a nutter in a beemer 5 series
2008 Mondeo 2.0 TDCi Titanium X
"Always look on the bright side of life, dedo, dedo dedodedo"
Don't twist them together. Go to a motor factor and buy some inline insulated crimps, they don'e cost that much. Kapton Polymide tape? The outer later of insulation of Kapton cable, prone suffering from cracked insulation causeing carbon arc fires that don't trip C.B.s or blow fuses resulting in major damage . I'd leave it on ebay.
It may only be 12V but it's the amphere that kills you!
3Ltr V6 ES9J4S D8