Giant hub light

[geoffduke]

i have a giant rs3 bike with a hub powered front light, there are three pins on the light but only 2 wires, also at back of light is a rubber cover, is this an off/on switch?

have connected in various permutations, but is not working, can anyone help?

[Bill]

Ok not a pro on these but to save everyone trouble here is a link to all the dynamo hub technical docs shimano makes.... http://techdocs.shimano.com/techdocs/blevel.jsp;jsessionid=8MSGNfxB4L1877g2lDRGPC6RLNnDBTyRn4nK2GM1jj2TwL8g2QtW!12948​12215?FOLDER%3C%3Efolder_id=2534374302051168&ASSORTMENT%3C%3East_id=1408474395181679&bmUID=iWfgfVN

Not sure which one is yours.

Bill

P.S. here is the stats on your bike..... http://www.giant-bicycles.com/en-GB/bikes/model/tourer.rs.3/4871/39007/