if I buy the extension prefab from link above, do I just connect my red and black to one dnd and since I don’t have 3rd wire, just leave it alone?

That is correct - the 3rd wire is a signal wire for ESCs and servos

Hey buddy you are using wrong plug, 2 terminal. You should use 3 terminal plug. Just use Red and Black leads. All you are doing to power up your LED's. Either use VCC or 3rd channel on your RX. Channel 1,2,3 & VCC are parallel, once you turn on your ESC, voltage is there. If anything redo that octopus you have there, get rid of the wire nuts. Photo of plug connected to RX.
https://cimg2.ibsrv.net/gimg/www.rct...494decc7dc.jpg
https://cimg9.ibsrv.net/gimg/www.rct...37d03f10ac.jpg
https://cimg1.ibsrv.net/gimg/www.rct...a207d8b39b.jpg

how do you suggest getting rid of the wire nuts? They are only thing holding all the reds and blacks together

Study your XMas LED's. Connected in series, one LED out, they all go out. It only use 2 wires, + and -. If you have a module to flash follow instruction on the module.

there are wires to each LED, light bar and siren speaker

What manufacture of LED light kit so I can see the schematic of it.

it was one bulb and I drilled holes and put each bulb in and then connected all the wires. 4 in front 6 in the back

https://evandesigns.com/products/fla...dc63ca0a&_ss=r

bought from this site. Originally for 9v battery but I got tired of changing batteries

I dont mess with light kits. I'm a racer, not a basher. Racers know they are illegal. If you dont know a thing about series of Parallel circuits, I dont have the pateints to go through it. Instead of purchasing the cheap LED's afigure out to set it up. Should have search for RC Flashing light kit with a module. It give you everyrhing needed to power it up to your RX, and it programable to flash. It'll look better then the octopus you have now.

Good Luck with your project.

Is this really where you want your money going?
 

I cannot speak to the quality of the products sold by Hansen Hobbies, but I can speak to the character of the owner and sole employee of the company, Christopher Hansen.

Chris is well-known in our community as a bully and a jerk. His anti-Black racism has been called out by prominent members of the community. He actually sued a robbery victim for false imprisonment (yes, this makes zero sense). And perhaps most heinously, and for reasons I can't understand, he's desperate to get his hands on the video of an Urbana police officer being murdered. He's actually suing the City of Urbana and the Illinois State Police to get the video. I'm pretty certain the officer's family is not on board with this grotesque effort.

All of this is fully documented here: TruthToTrolls.org