airbag swap wiring question

anyone here clued up with airbag wiring.im fitting a steering wheel that started life in an MG ZR.the airbag on this steering wheel has only 1 wire.the airbag on the micra has 2. normal logic tells me the micra has a positive and negative wire,and the MG has just a positive and it would just be a case of earthing the remaining wire onto the column.but i might be wrong and i dont fancy getting my head blown off when i start the car.
 
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