Now that you have purchased and fitted the lights, it’s time to have them wired CORRECTLY to the bike, so that everything is safe and you can enjoy them years ahead in time.

As a general rule, I always try and make the harness removable, so if I undo it from the bike, there would be no trace of it ever being there. This means no cutting or splicing in the OEM bike harness, so no electrical gremlins later on.

The best and safe way to do this is power them via a fuse and relay(everything is provided in the Hella FF50 pack). Below is an example of how it should be wired, with and without the switch triggering them on and off:

(^^^withoutanyswitch^^^)

(^^^withthegreenswitchprovidedintheHellaFF50lights^^^)

Keep in mind that the LED’s are basically diodes and that means that they have polarity, so you have to fit the + LED terminals to the + relay output power source and the – LED terminals to the battery – terminal/ground.

The power consumed by these lights is ~ 30W per set, so checking your charging system is not a bad idea, after everything is done. A normal voltage output should be between 13.7-14.4V, both at idle and revved engine speeds.

As for the “Switched 12V supply” in the above images, I like to use the bike’s rear parking light as source. This is what triggers the relay into closing the circuit and firing the lights up. The power consumption for the relay’s coil is very low, negligible even.

The following images describe getting to the parking light on a 1200/1250 BMW boxer.

After unscrewing the rear fender so that access to the rear light is possible, the connector reveals 3 pins: negative/ground, + for parking light and + for the stop light. We are obviously interested in the + for the parking light, because, like I said, this will trigger the relay whenever you switch ON the bike ignition, and stop it once you switch OFF the ignition. This way, you will know for sure that the bikes will be lit at all times!

The wire of interest is the gray/red one:

You will have to push back the black casing for the connector:

Then remove the white tab holding the pins in place:

Push on the pin tab and extract it towards the back:

Solder a thin wire to it:

Fit it back into the connector and assembly the rear light in reverse order, with the new wire as the relay trigger source: