Transbrake Wiring to Backup Light Switch

Need a more complete diagram of the trans brake wiring. Is the red and blue supposed to be the same terminal?

The way the "blue" section works is the blue is live in reverse/ key on. The diode will conduct whatever load is on the transbrake side, through the diode AGAINST the arrow, and back to the B+ present at the reverse lights

Diodes conduct neg to positive AGAINST the arrow, that is "electron flow" neg to pos

Like below: Lamp on the LEFT will light up