If I read your drawing correctly, only one motor should run.

Question, did you cut the red wire on BOTH ESCs? Or just one.

If you're really careful with a small flat screwdriver (or point of Xacto blade), you can pry up the plastic tongue holding the red wire lead in the connector and put the wire out. No damage.

A pair of 4130/16 are going to draw some serious amperage. Is your battery pack 3 or 4 batteries in parallel? So you're not draining them faster then they can handle?

A suggestion, run your blue wires together, then put your switch between the battery and where they join.



Good luck.. Keep us posted, an electric twin is on my wishlist....