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You dont need to spend £30 on a multimeter if you dont want to... get a 12v bulb from somewhere... solder a couple of wires onto it... put one to an earth point on the chassis and one on the wire you want to identify... if it lights its positive... if it doesnt its an earth or the circuit isnt live... ie lights arent on if its an illumination circuit... its not fool proof in this sence but its cheap.
i wired up my invertor to my lighter ll check the colours and let u know i just tapped em all found the +ive one and guessed the neg ll let u know mine works perfect