I have a Poulan Pro 48" hydrostatic drive rider that had a 22hp engine.  It went up in smoke so I swapped in a 18hp briggs opposed twin.  I got everything hooked up and started but find the briggs has a two wire alternator and the original had a three wire.   I have an electric clutch and I can't get it to work with the engine I have in it now.  Is there any way I can get this combination to work without changing to a new flywheel/alternator?