Question about wiring a circuit!!!! help!?

Question

do i connect the positive terminal of the circuit to live or neutral on the power module?

Answer 1

It depends absolutely on what you are trying to achieve.

Most - but by no means all - circuits use "negative ground", where the lowest potential is grounded

There are several reasons why a positive terminal would be grounded, the most apparent to me is to create a "split" supply, for example +12 and -12V;

Many old cars (I mean 60+ years old) used a positive ground system.

Answer 2

I don't think anyone can give you a safe answer unless we see the circuit and components. BUT, the neutral side of any circuit should not be connected to power.