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I am trying to find or figure out the correct hi/low beam switch on my 66 Monza. It was not there when I got the bike. It looks like the switch mounts on the left hand clutch control mount. I did find one from a 160cc but it has different mounting screw centers and this switch controls all the functions of the the headlight and looks completely different from the one in the parts manual. I see some repro CEV like switches for sale but they say they are for mounting on the 7/8" handlebar. Anyone know what is the proper switch and a source?

Any help would be appreciated. Thanks

Hi SJM,

This is what my 65 Mach 1 has, I think they would have used the same on the Monza.

Cheers,

Stewart D

My Monza is a 66 as well, and yes it has the same switch as what StewartD posted.

Thanks for the information, I thought that was the correct switch. One more question, does the switch you show mount to the LH clutch lever mount or directly to the handle bar?

thanks

[quote= sjm44 ...
" I thought that was the correct switch. "

____ I confirm that the pictured switch-itself is indeed correct for the Duke-models which originally employ battery-powered ignition-systems.



" does the switch you show mount to the LH clutch lever mount or directly to the handle bar? "

____ For stock Duke-models, I've only ever seen them installed onto the hand-lever support/brace,, however the particular plastic-base is what determines whether such a switch was meant to mount against the brace or directly to the bar, (as that base-part can be found with different radius-sizes to fit either).


Duke-Cheers,
-Bob

Hi SJM & Bob,

It is left handlebar, the clip ons are 22 diameter (7/8"). These original clip ons have integral brake & clutch lever mount brackets, and so switch mounts direct to bar. The lower indicator switch is, of course, not original for the Mach 1.

Cheers,

Stewart D

My 68 350 has the same switch mounted to the handlebar, I bought a replacement many years ago and it melted as soon as I changed to high beam.

They really do need a relay to prevent that.

[quote= remery ...
" it melted as soon as I changed to high beam. "

____ If you actually mean rather soon there-afterwards, then either your high-beam circuit must've been nearly short-circuited (somehow),, or (more likely), the switch-contact for the high-beam circuit must've been curtailed* in some manor ! - (* dirty; corroded, etc.)
Cuz the high-beam bulb-filament normally only consumes just 5-watts more power-juice (than the low-beam).
__ Those stock switches can possibly handle a 45-watt 6v.bulb, (which flows 7.5-amps),, but they do allow heat build-up from between their connection-contacts, and-so really ought-to be saved from possible burn-up/melt-down with the use of a relay (as Jordan has already suggested) ! _ As relay-units are considerably cheaper to include rather than replace the stock-switches, these-days !


Dukaddy-DUKEs,
DCT-Bob

DewCatTea-Bob wrote:[quote= remery ...
" it melted as soon as I changed to high beam. "

____ If you mean rather instantly, then your high-beam circuit must've been short-circuited ! _ Cuz the high-beam normally only consumes just 5-watts more power-juice.
__ Those stock switches can possibly handle a 45-watt 6v.bulb, (which flows over 7-amps),, but they do allow heat build-up between their contacts, and-so really ought-to be saved from possible burn-up/melt-down with the use of a relay (as Jordan has already suggested) ! _ As relays are considerably cheaper to replace these-days !


Dukaddy-DUKEs,
-Bob

How about just putting in an inline fuse holder?

From my experience with a Moto Guzzi Ambassador, I know that the old CEV switches can fail due to corrosion and moisture on the contacts. After my first switch failed on the Guzzi I would take off the cover and spray the switch down with WD40 any time I rode in the rain. It survived for a lot of years with that kind of maintenance.