These bulb adapters simplify the installation of our LED rear light units by reducing the amount of rewiring you will need to do. The adapter simply plugs straight into the existing tail light bulb socket in the conventional push-twist-release bayonet fixing way, just as if you were installing a new filament bulb. This adapter is intended for use with the small number of motorcycles which have not yet been converted to dual-action stop and tail lights. Originally many bikes were built with only a tail light with brake lights being introduced many years later. If your bike still has a single filament tail light, this adapter will allow you to connect the tail light function of your new LED rear light unit to that without any rewiring. The brake light function can then be added by separately connecting the brake light wire to the brake switches, without modifying the tail light.
At one end of the adapter is the single contact plug that fits into the existing tail light socket in your Lucas light. This looks like the metal bottom half of a conventional filament bulb, but without the glass globe on top. The necessary connections are soldered inside and then potted in place with epoxy resin for added robustness. Two wires for the earth and tail light connections lead from this plug and up to a special 3-pin connector which clips into place on the back of the LED light board. The adapter length is approximately 100mm (4″) to give enough flexibility for installation, but without having too much wire getting in the way and making the installation look untidy. The third brake light wire from the 3-pin connector on the rear of the LED circuit board is approximately 300mm (12″) long and can be connected as required to the brake light switches.
A number of different adapter types are available to suit most classic bike installations I have come across. Please make sure you select the correct one for your bike by referring to LED rear light connectors and adapters page.
The BA15S connectors are a non-standard option which are only required for bikes which currently have a single filament tail light bulb fitted. There is only one contact at the base of the BA15S plug which gives the connection for the tail light function, hence the brake light function is supplied by a separate wired connection.
Please note: If you wish to order this adapter along with a new LED light unit, simply select the adapter from the drop-down connection option list on that product page and it can be substituted for the default three-wire connection at a discounted rate.