Congrats lv6l..
You have done it all by yourself !!
Your wiring is OK.. You can isolate or or cut the loose red wire, so it won't harm things
And please isolate the connectors between the wires! You don't want them to touch eachother!
The flicker can have many reasons: Electronics-problem, Ballast-bulb match.. So I cannot directly solve that problem for you..
Furthermore: The ballast has an input-range quite wide, letting it shutt-off by itself is not a wise thing to do when you want to keep the battery in good health! SLA-batteries don't like deep-discharge !
And, like I said earlier: Charge the battery after every use, no matter how short!!
Very nice beamshots,,:duck: Welcome in the world of the proud owners of a light-monster !!
Regards,
Ra.