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There is a thread on the LocostUSA forum asking about reusing the connectors in a wiring harness when adapting it for a Locost. I explained how I attach wires to the crimped connectors and am presenting it here.
This method should not be used on high current connectors. If the solder melts the wire could come free and short out your wiring system.
The very first thing to do is to get the metal connectors out of the housing. Figuring out how to get the connector out of the shell is the hardest part of this whole process.
There are many different types of wiring connectors which use different methods to retain the actual metal connector in the housing. Because there are so many ways of doing this I am not going to attempt to try to explain how to do this for any particular connector. (Sorry 'bout that.)
You'll have to try to find the manufacturer of the connector for information. Although after awhile you will probably be able to figure out the simple connectors by just looking at them.
In general though the common connectors found on most wiring harnesses use a retainer tab that holds the metal connector in the plastic connector housing (see picture below).
The plastic housing has a stepped hole that the connector is inserted into. As the connector is inserted into the connector shell the retainer tab at first is pressed against the connector and then pops into the open condition as shown in the above picture as the connector hole steps to a slightly larger diameter. To remove the connector the tab has to be pressed back against the metal connector so it can clear the decreased diameter of the plastic hole. Once the tab is pressed out of the way the wire and connector is just pulled of the rear of the housing.
Generally you insert a thin probe (a dental pick or a thin jewelers screwdriver) into the area around the metal connector from the side opposite of the wires and press the retaining tab against the side of the metal connector. You will probably have to push on the wires as if you want to push them out the front side of the connector. This relieves pressure on the retainer tab so it can be pushed out of the way. Once the tab is against the connector itself you just pull the wire & connector out the back of the housing.
This is a tool that sometimes can be used by inserting it along side of the connector to push the retaining tab out of the way. I've had it so long that I can't remember which company made it but I'm pretty sure it's still available. The red handled portion is slightly larger in diameter than the white one. You might be able to make one using a thin piece of a soda can. Mine seems to be made from spring brass.
Now that we have the connectors removed from the housing here are the steps to attach the new wires:
This picture is NOT a typical connector used in low current automotive wiring harnesses but it clearly shows the two crimps that you will be working with. The normal wiring connectors will be the tubular or square looking ones similar to the 1st picture.
Here's the sequence of events to connect your new wire to the metal connector.