Soldering joint on thick 12v 30A wire

[john.r2]

I have power seats that use several different 12v motors mounted on the seat itself. The main 30A fused battery connection wire to the seat and the ground connection are similar thickness because of the amount of potential current draw the motor may have. I need to junction of those two wires to run another switch. My question is, If i was to sleeve it and solder on that existing wire, will the solder effect the current or potentially not be able to cope? I would think that the wire is still doing the job as long as all the strands are intact and the solder is just keeping it bonded together.

 

[ivak245]

As long as it is a good (not dry) solder joint, all should be good. Just make sure you have a good insulator (heat shrink, etc,) around the joint. If you don't solder well, practice on some scraps, you don't want the solder wicking up the wire under the insulation.

 

[Bluejets]

If it's as thick as you "don't say" you will have difficulty soldering. Better to crimp.
Note:-(wire is measured in a variety of ways to convey the thickness...thick wire is not one)
We have no idea what you have there otherwise.
Just because a cable is a certain guage, doen't mean it was done that way for current.
In fact I doubt your 30A would even come close to the demand.
Cable in automotive is mostly sized due to the voltage drop associated with the cable length.