Power wires at battery +, 4 red wires Options

[Tom]

Have you checked yours lately? These seem to be becoming more of a problem. When I redid mine, I found the wires to have multiple broken strands at the solder to wire connection. As more strands are broken, the current carrying capacity of the wire is degraded. Below is something I copied from a forum on solder/crimp connections.
Almost any soldered joint will last forever if there's no vibration - that's the key. The solder itself isn't what fails, it's the interface point between the copper wire and solder, that's where the wires - not the solder - fail.
How true and this is just what I found on mine. If yours are OK, a way to help prevent the breakage of the strands is to immobilize the 4 wire harness with a sticky pad and a nylon tie as close to the connection as possible. Two, one above the other would be even better. This would keep vibration and movement to a minimum. I think most of our cars used to have a small piece of thin sheet metal welded to the left rear side of the battery tray just for this purpose, however, most are long gone. From the pics of engine bays I have looked at, almost none were being used and the harness was hanging loose, allowing vibration and movement that stresses the soldered connection.
If your 4 wire harness is long enough, you could do what I did in the pic attached. If you decide to do this, check how much movement you get by shaking the harness below the tie point and see how much less movement you get at the soldered connection.
Tom