Need help from someone with a boost-a-spark

[Mustang Matt]

I bought a used boost-a-spark. It doesn't have the fuse attached so I can't tell which wire is input and which wire is output.

One of the wires is slightly more pink than red and has silver writing on it. I think this is supposed to be the fused input. Could someone double check theirs for me?

The other red wire has no writing on it.

Thanks!

 

[Mustang Matt]

Anyone have a boost-a-spark on the shelf or accessible?