The lights in question are CATZ XLO "Acid Orange" lights: You can find them on Fleabay but if you email Jeff (jbendit@aol.com), buy them off-eBay and pay with a USPS money order then he'll bring the price down a bit as that saves him eBay and PayPal fees.
Johnny originally found these awesome lights and came up with the idea of mounting them on the reflector bolts. I perfected it it by finding some stainless spacers and bolts that make for an easy and clean installation.
They really are amazing lights and have to be seen in person to be appreciated. The different color of the orange and the fact that they're 70W really make them stand out without blinding other road users. Not only that but the triangle they form with the headlight makes it easier for other road users to judge your speed and distance.
In addition to greatly reducing the chances of you not being seen, they also make lanesplitting in California easier and on two lane interstates members of the LLOC (Left Lane Owners Club) tend to get out of your way more readily.
PowerSince a pair of these lights adds an additional 140 watts of power draw, with the exception of the 1993 K1100RS, any 1993 or earlier K bike will require that you upgrade from the early 32 amp alternator to the later 50 amp alternator. 1994 and later K bikes all came with the 50 amp alternator so the additional power draw should not be an issue.
MountingOne of the nice things about these fog lights is how easy they are to mount. Using a longer bolt for the front fork reflector and a couple of spacers, installation is simple and straightforward. You'll need two spacers on each side, one to stand off the light housing past the front fender and another to go between the two mounting tangs on the fog light housing.
Stainless steel spacers can be purchased from McMaster-Carr. The smaller spacers (product number 92320A878) are 7/16" inches wide and the larger spacers (product number 92320A670) are 1-1/4" wide. You'll also need some longer bolts that are M6x90. McMaster-Carr only sells these in lots of ten (product number 91292A204) so you might be able to save a few bucks by finding a local source where you can buy just the two you need.
UPDATE(5/11/12): Since the mounting bolts need to hold the fork reflectors as well on an K1100RS or K100RS4V, it can be a tight fit so it's probably a good idea to get two stainless M6x100 bolts. That's the next size up and they're probably a little long so you'll want to mount the lights, reflectors and front half of the fender and then cut off any excess (hacksaw or Dremel cutting wheel) bolt sticking out past the nut so the bolt doesn't hit the front tire. The McMaster-Carr part number for M6x100 stainless bolts (pack of 5) is 91292A205.
Note that since their dimensions are SAE, not metric, the smaller 7/16" spacers are just a tad wide for fitting in between the fog light housing mounting tangs so you'll have to file them down a bit in order for them to fit.
These lights are meant to hang from a bumper so you'll want to remove the screws from the sides and flip the bulb and front of the lens housing over so that the drain hole is on the bottom.
If your bike is a K100RS4V or K1100RS, due to the minimal clearance between the fork leg and tire sidewall, the direction of the reflector bolts is reversed so you'll need to remove the front wheel in order to remove the old bolt. Consult your owner's manual or
see this thread for instructions on how to remove/install the front wheel.
WiringWiring them up is pretty straightforward and similar to adding any auxiliary lighting. Since the draw of a pair of these lights is 140 watts, one important thing to make sure of is that the lights are turned off by the load shedding relay when the start button is pressed. The simplest way to make sure of this is by tapping the XLO relay into the headlight wiring for the left combination switch. Depending upon how you want them powered, tap into either the white/yellow wire (headlight power), yellow wire (low beam) or white wire (high beam) at the connector for the left combination switch.
Below are three possible options for wiring them:
Always OnThe following wiring diagram shows how to wire the lights up so that they're always on when the bike is turned on except when the start button is pressed:
On/OffThe following wiring diagram shows how to wire them if you'd like to have on/off control of them. A BMW hazard flasher switch can be used for this purpose.
Tapped Into Low Beam and High BeamUsing a BMW heated grip switch, the following wiring shows how to wire them up so they're either on with only the low headlight beam or the high headlight beam. This is how I usually wire them up. During the day I run them with the low beam. If I flash the high beam to get noticed then that turns of the fog lights at the same time and makes the flash more noticeable. It's also handy in the fog at night when you don't want to run the high beam. At night when it's clear and aux lighting isn't as necessary, I run them with the high beam only to fill in below the headlight.
