I typically use a 6 volt Estes or the 12 volt BMS controller at the schoolyard soccer field launches. The Estes controller needs a repair every few years.
Where the red lead wire exits the controller body, the insulation can wear. The interior wires are thin and too many flexes can break it.
On the left, the two screws were taken out, the back plate lifted. The batteries were removed.
The "L" shaped cover piece was glued on. I had to pry it off using the screwdriver of my pocket knife.
These are the two contact points that will be worked on.
Pull the metal plate off, straight up with pliers. It'll take some wiggling to get it off. The wire will come with it.
The contact on the left side is held in place with a small Phillips head screw.
I'm certainly not a electrician!
Hold the metal parts with pliers when they are heated with the soldering iron.
Place the soldering iron tip on the solder. When it melts, pull the old wires free.
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