My S2 has had a new gearbox dropped in and the reverse lights dont work. Were is the first and subsequent places to look for this fault?

Chances are its quite simple as the installers neglected to attach the exaust mount either

 

check to see if you have the reverse light switch connected if you do disconnect the multiplug bridge across the multi plug with a paper clip and if they work you got a faulty sensor.cheers

 

As above

 

Firstly many thanks, but.....

Excuse my ignorance but where is thesensor located?

Sorry complete newbie biker

 

Front of the gearbox, by the mount