Center stage is the 10 amp fuse for the Battery.
Note the Sermos Connectors that are also attached to the Whatt Meter. I ordered it this way because I have sources and loads with that type of connector that I may want to test.
I carefully removed about 1/2 inch of the Silicone wire insulation on the whatt Meters leads and wrapped the Molex pig tails around the bare wire, then soldered them in place, then wrapped with either black or red electrical tape and put a small Ty Wrap around the tape to keep it from unraveling.