Headlight issues-1975 Cb750F

[lcochran]

So my high beam has gone out but my low beam still works.  I pulled the headlight off to go to Autozone and get a new bulb.  And apparently this is a sealed headlight unit??  Anyone know why the hell honda did this?  also, what can i do to replace the bulb? do i really have to by a $25 dollar sealed unit off of ebay.....or could the issue not be the bulb but the terminal in my controLs?
Thanks

[sgtslag]

In 1975, they pretty much only had sealed beam headlights -- if one of the two filaments burned open/out, you had no choice but to replace the whole unit.

If you have a volt meter, with a resistance/Ohmmeter, or continuity tester, connect it across the bulb connectors:  there is a common ground, and then the Hi/Low filament connectors.  Measure the resistance across the Hi and Low beam connectors, and ground:  either they will measure very low resistance (<5 Ohms = good filament), or open (Infinite Ohms = bad filament, filament is burned out/open).  If both filaments are good, then the problem is your circuit wiring, and/or controls (very unlikely....).

I bought a standard, 7", sealed beam, Halogen headlight, at Napa, last year, for $11.  Measure your old headlight, and see if it is a standard 7", automotive lamp.  You do not need to buy the expensive, name brand bulb -- they all work, and they are all designed for rough usage (cars bounce pretty hard, shaking, and thudding, the bejeezus out of the headlights and their burning filaments...).  If you want to convert to an H4, with replaceable bulbs, you can do so:  purchase a round, H4 Lamp Assembly of the correct size.  Note, however, that H4 bulbs are dual filament bulbs, too.  The other option is to buy an HID kit for your bike -- expensive, but only one 'bulb', sans filaments, with only one level of beam power.  Cheers!

[lcochran]

Thanks a lot.  My autozone carries the part, i'll just keep it original and replace it.
Thanks

[MarkPBG]

If you don't have a volt/ohm meter, you can test the light with a battery and a few short leads. The three terminals on the back two are vertical and one is horizontal. The horizontal you connect to negative of the battery, and the other two are the positive leads for the high and low beam filaments. Run a hot lead from the battery to each terminal in turn and see what lights up.

I had a guy at the parts store ask me once why his low beam kept burning out while the high beam never did. I just asked him which one he used more often. lol

Good luck with it.

[Re-run]

I never had the sealed light. I started with a vetter and then got a 7 inch H4 unit. Much brighter since it is halogen. A 7 inch unit and bulb would run about 50-70 I would say but again, brighter light. Word of warning though, make sure your charging connectors are clean and tight since the sohc charging is not the best.

[lcochran]

Thanks yall.  I'll be getting one from autozone soon.  Maybe ill consider switching to High quality lights in the future.  98% of my riding is day time so, these lights do just fine.