BK Controller set up problem

[GriffinRU]

Originally Posted by evader

It's hard because of the glare from the shrink wrap...but here's what I was able to get. The first one shows where it is supposed to be (I think) and the second picture shows that I can just pull it out...I could pull it out all the way if I wanted to...

That is how it should look like:

And looks like you correct the wire is loose...not good.
You can try to resolder or attach this loose wire to black (negative) battery lead connector.