How to make Toy Voice Changer (AA battery) Run on 12 Volt

[FrankTank]

Alright.
I am going to hook up today or tomorrow.

As follows: Battery---->Toggle/Rocker Switch---->InLine Fuse (1 amp Fast Blow)---->Buck Step Down Converter----->Toy Voice Changer and then Speaker Output--------> Amplifier Input------>Speakers at Output

Sound about Right?

I will probably connect the Amplifier Power to the same Rocker Toggle Switch.

I think since it is a golf cart install I need to connect grounds to the frame and not back at the power/battery. I will have to double check.

 

[FrankTank]

So I finally have gotten around to hooking this up....after a long recovery from surgery.

So everything works great with the amplifier, buck converter, speakers, and the voice changer. But now I am questioning the Power and Fuse. If I am connecting 2 separate power lines (1 for the amplifier and 1 for the voice changer) to one toggle switch. Where/how do I measure the amperage. Where do I put the multimeter leads to get/test the Total Amperage of both units?

Hope this makes sense. And then for instance it reads 2.61....then I need a 3 amp in-line fuse?