New battery wiring - DIY advice needed

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Not sure that soldering is a good idea.
Firstly you are introducing dis similar metals in close proximity and this will encourage corosion.
Secondly you are creating a "hard" spot where the solder ends and with the inevitable vibration this will eventually lead to the cable fracturing.
I believe that crimping is a better solution and any car electrician should have the necessary crimpers and probably be able to do the job in situ.

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Corrosion with the dissimilar metals in a solder joint on a boat is not often a problem.

The hard spot and vibration sometimes can be. The solution is to make sure that the cable is clipped and tied appropriately.

On the subject of soldering, I agree with the poster who says. 'don't try and tin the wire'. Clean components, some flux, enough heat, and introduce the solder, and everything will flow together.

Crimping is a possibility if all else fails!
 
A lot of the impurities that cause "dry" joints which is what you're probably getting, can be overcome by using acid core solder. And no, the acid doesn't continue to eat away at the cables after the job has been done. Dipping the soldered joint into water whilst still hot results in a clean and tidy and properly soldered joint.

This whole soldering thing is also harder on cables that are not tinned. Does anybody still use them on boats?
 
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