I purchased a multi remote switch on/off that controls up to 7 devices. I have sirens on a 9v but I have lights and a light bar also that have plugs. Is there any other way to get all the lights on simultaneously? If I use the remote switch I believe one would come on first then the other.

Got a link to a product page of what you've got?

Is this a RTR car or an aftermarket upgrade kit? What brand of radio are you running, etc?

Hard to understand what do you want. Better show us a picture.

I can’t apparently put in the link to the product because I haven’t done 10 posts yet. The product is multi switch remote from HobbyKing.

I got my LED lights and siren from modeltrainsoftware.com. The LED light bar was aftermarket. I bought the car off eBay from redcat racing. It’s the Vaterra Camaro ZL-1 V 100 S 1/10th scale.

I bought a light kit from vaterra as well which has no manual so I’m not sure how I’m going to put it together and no YouTube videos.

the LED bar has a plug already. I am going to get the lights on a JR plug connector and I’m just going to have to use the 9v battery.

My remote is a FlySky GT3B. I only have the 3 channels so only I think I can plug the remote in to make the devices work but nothing would come on at the same time so I’m wondering if there is any other options besides buying a reciever and remote with more channels. They can get quite expensive and my wife is already upset that I spent so much money on the car. This my first RC so I have no idea. FS GT3B is m

What I've done to control additional devices is to use a sacrificial servo hooked up to the 3rd channel and instead of the power going to the motor of the servo, use the leads to power your external devices, you'll have to strip down the servo completely to get to the circuit board in similar fashion to this here: