How do I make BoolValues from a script interact with another script?

So I'm making a terminal to capture, and I want to make it so when you step on it it sets a boolvalue to true, and when you touch all 3 terminal points it turns all 3 boolvalues to true (If that makes sense). After that I want a separate script to start a timer, but my problem is that it won't recognize the bools from the other script.

Does anyone know how this would work? I have tried the following, but it probably shouldn't work anyway.

local ValueA = game.Workspace.PartA.ValueA
local ValueB = game.Workspace.PartB.ValueB
local ValueC = game.Workspace.PartC.ValueC
if ValueA and ValueB and ValueC == true then
print'yay'
end

This doesn't end up printing anything. Thanks for stopping by, and thanks if you answer.