Trailer light wiring dilemma

[cactusjack]

I have a question related to trailer light wiring. I will be using a Hoppy taillight converter to isolate my trailer electricals from the Nomad. The Hoppy output is 4 wires: LT/stop, RT/stop, tail/marker, and ground. I know how to wire the 4 marker lights and the STT LED units for the back end.

I thought this might be a good opportunity to use the 15" slimline STT light I bought a while back for my trunk, that didn't quite work as planned. I was thinking of mounting it on the rear of the cargo box near the top, to act as a third brake light/running light. My problem is this: Since the turn and stop signals are carried on the same wire, how can this be done? Again. the running light part is no problem, but if I connect the 15" light to one of the stop/turn wires, the brake light will work, but the light would blink if the turn signal was actuated. That in and of itself, wouldn't be such a bad thing, as it would act as an additional turn signal indicator. Is there some way I could connect the stop/turn wire of the 15" light to both the RT/Stop and LT/Stop of the trailer lights? There is a problem with this, because then there would be a continuous circuit to both taillights and the right signal would blink when the left is activated and vice-versa. Would it be possible to place a diode inline so when one signal is activated it would not flash the other?


Here is a crude schematic of my idea:



I realize that one way to solve this problem would be to run a direct connection from the brake light circuit on the bike to the stop light wire on the third brake light, but that would defeat the purpose of the Hoppy converter and would require an additional connector at the hitch. I'd like to retain the standard 4-pole connection between the bike and the trailer, so I could use the trailer with another vehicle, if desired.