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MTXL
  • Rank:Bronze Member
  • Posts:20
  • From:USA

Date Posted:07/17/2017 11:18 PMCopy HTML

Last summer when I was neck deep in my bike, I found a thread talking about putting this headlight in an XL. I bought the light...and it sat since probably this time last year. I cannot find that thread now...
But the light is for a CL100/CB100B. 

My bike has two white wires, a blue wire and a green wire. So the old headlight has those colors, and the white has a double female connector for my two white wires to plug into. One goes to the hi/lo switch, the other goes to a resistor/ground and bleeds off current for lo beam. 

The newer CB headlight has the same color wires, plus two more coming out of a second, smaller bulb. I think I can ignore the small bulb. But the difference is that the white wire has only a single female connector. So nowhere to plug in my resistor. The blue wire has a double connector...

Am I right in thinking that since the low beam on this CB headlight is separate, and I won't be hooking it up, I don't need the resistor? So all wire colors would be the same, I just don't plug in my bikes second white wire? 

Anybody used this same light? It's an exact fit for our bikes, no modifications needed (other than a little difference in wires obviously). It's still 6V. 


MTXL #1
  • Rank:Bronze Member
  • Posts:20
  • From:USA

Re:Putting a CB Headlight in my XL

Date Posted:07/18/2017 11:55 PMCopy HTML

Well I finally got a chance to spend enough time with an online wiring diagram for the new headlight, and my wiring diagram. I just left off the second white wire on my bike, used to bleed off current for the low beam, hooked everything else up color-to-color, ignored the small bulb on the new headlight and its wires, and it works just fine. 

Old bulb filament must have broken when I drove the bike down from my friends on the back of my truck, bouncing around...

I don't remember if they don't make the headlight for my bike anymore, or if there was some other reason I bought this headlight. But I know there was a reason...

Anyway, if it matters to anyone, the Honda part # is 33100-439-003    Original Listing

It fits a whole bunch of bikes very similar to mine, all around the same year, but not mine specifically (1975 XL250 K2). 
tuscarawas #2
  • Rank:Diamond Member
  • Posts:553
  • From:USA

Re:Putting a CB Headlight in my XL

Date Posted:07/19/2017 1:05 AMCopy HTML

Thanks for sharing the information about your headlight. I'll keep this in mind.
skorpioskorpio #3
  • Rank:Diamond Member
  • Posts:747
  • From:USA

Re:Putting a CB Headlight in my XL

Date Posted:08/18/2017 5:54 AMCopy HTML

MTXL #4
  • Rank:Bronze Member
  • Posts:20
  • From:USA

Re:Putting a CB Headlight in my XL

Date Posted:08/24/2017 10:32 PMCopy HTML

 Yep, that looks like the one. 

Thanks, by the way. 
JKCanuck #5
  • Rank:Bronze Member
  • Posts:27
  • From:Canada

Re:Putting a CB Headlight in my XL

Date Posted:12/26/2017 9:37 PMCopy HTML

MTXL, I know it's been many months since you posted about the cb100 headlight wire differences.  You've probably resolved any problems with the extra low beam (white) and deficient high beam (blue).  Just in case others may try to use a 6v cb100 or 125 headlight, the problem arises out of the fact that lights on those cb bikes are 6v battery powered (dc) rather alternator powered (ac) headlight as on the larger xl units.

XLs have a high beam indicator light (1.5w) which, along with the main beam (35w) roughly equals the sum of the low beam (25w) and the 3.61 ohms resistor (about 11.25w, using Ohm's and Watts' laws), both circuits using nearly all the roughly 40w that the lighting coil can produce, which theoretically keeps the bulb from blowing out.  The low beam circuit is particularly vulnerable if the resistor is missing or not working.  Keeping the high beam indicator bulb (2nd blue wire) in use is less critical than keeping the resistor in the low beam circuit (2nd white wire). 

The output of the XL alternator is variable with rpm and notoriously blows bulbs at high rpms if the indicator bulb and the resistor aren't functional, where the cb battery-powered lights don't get voltage that's too high, the battery acting as a regulator.  Since the XL sealed beam bulbs are so ridiculously expensive, using aftermarket reflectors and modern replaceable bulbs is an excellent idea, but you have to stick to the standard wattages and wiring structure or they won't last.



Go soothingly on the grease mud ... as there lies the skid demon! ...





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