Monza Square headlight parts.

[DewCatTea-Bob]

" Here`s what I have. "

____ Okay but, it will of course still be helpful to answer my questions concerning that which isn't obvious in your pix.
__ I see now that your wire-harness is indeed home-made and that whoever constructed it TRIED to do decent work of it. _ So I'm expecting that you can continue making-use of it, so long as we first iron-out that it's all indeed good-to-go.
So-far, it seems to be connected-up to your terminal-box/regulator-unit properly (with the pinkish-purple wire substituted for the original Gray-wire).
__ You've indicated that there's a green-wire within the harness that's to be connected-up up-into the headlamp,, that's not as stock but may still be useful... Can you tell me where it's opposite-end turns-out at ?
____ Do you have a continuity-tester or ohm-meter so as to be able to check & be sure of which wire is actually which ?

[averydad]

I`m just out of the garage and have visualy traced every wire on the bike.

Wires (formerly) in headlight bucket....

BROWN - direct to terminal box
PURPLE- direct to terminal box
RED- to pos. battery
GREEN - to coil
BLACK - to tail light
BLACK- to brake light switch
BLACK- dead ends near coil. I may have dislodged this wire from a ground as it looks to be freshly pulled from a connector.

Wires at terminal box...
RED- to pos battery
BROWN- to headlight
GREEN- to neg. battery
PURPLE - to headlight
YELLOW- both yellow wires go to generator (left engine case).

The only other wires on the bike are....
BLACK- from coil to points, right side engine case
BLACK- from brake switch to tail light.
BLACK- neg battery to ground on frame.

Thats all as far as I can see. There is no horn or handle bar switch.
I do have an multi meter/ ohm meter.
Thanks for all the effort to help me.
Rick

[DewCatTea-Bob]

Wires (formerly) in headlight bucket....

" BROWN - direct to terminal box "

____ As is stock,, that's good left as is !


" PURPLE- direct to terminal box "

____ That's okay, (since Ducati didn't use that color for anything),, while it should be GRAY, it can be used as the stock Gray-wire.


" RED- to pos. battery "

____ That's also as stock.
This Red-wire & the Brown-wire are for connection to a charge-flow indicator-lamp.


" GREEN - to coil "

____ The power-lead to the ign.coil should be a White-wire ! _ Green is the color Ducati used for Ground-connections. _ So I suggest using this wire for securely grounding the headlamp to the frame at the ign.coil's bracket-mount location.


" BLACK - to tail light "

____ That's as stock, so label it for what it goes to (so you'll know which black-wire it is).


" BLACK- to brake light switch "

____ That's also as stock (for n-c.models), so label THAT black-wire as the power-lead for brake & horn.


" BLACK- dead ends near coil. "

____ THIS black-wire could be used as the horn-button grounding-lead.

Wires at terminal box...

" RED- to pos battery "

____ That's as stock, so leave as-is.


" GREEN- to neg. battery "

____ That's also as stock,, so leave it as-is, as well.


" YELLOW- both yellow wires go to generator "

____ Just as is stock, so that wiring is already good-to-go.


" The only other wires on the bike are....
BLACK- from coil to points,
BLACK- from brake switch to tail light.
BLACK- neg battery to ground on frame. "

____ Most-all of that is also as stock & good-to-go, (only difference is that the Ground-wire from the battery's neg.terminal was Green).


" There is no horn or handle bar switch. "

____ Before we can go much further, we'll need to know what you'll have for switches.

[averydad]

Well Bob....
It looks like I`m not in too bad of shape. The homemade harness seems like a fairly nice job. As for switches.... I`ve seen an Aprilia headlight switch for sale at several vendors. I know Classic Ducati in the UK sells one they say is for NC Monza.
They also sell a terminal block, but is that really needed ? The main part I`ve yet to find is the ignition key switch. I have the early Monza wire diagram that lists part #12 as
"Extractable 4 contact key ". Do you know where I could find this part ?
The other parts I need look to be the warning lights. I have never seen an original Ducati like mine so I`m not sure what type light to buy or even where exactly they go. I`ve search the few book I have and looked on line but can`t find a clear picture of the top of a square style headlight. I have (besides the main switch hole) two holes of aprox 10mm and a smaller hole of about 6mm.

With your help , once I have the right parts in hand.....I think I`ll be OK. I have the color keyed Monza wire diagram, althought it is for the earlier model, everything looks to match up with what you`ve tought me. Now that I know what I have I`ve got confidence that I can make it all work !

Thanks a bunch

[DewCatTea-Bob]

" It looks like I`m not in too bad of shape. The homemade harness seems like a fairly nice job. "

____ I don't disagree.
We had a little set-back/discouragement when it was learned that your wire-harness wasn't stock, but now we know that it's not actually any real issue, (as it has nothing wrong with it enough to need to be replaced). _ You just need to add one (white)- wire to it. ...
The 3rd.black-wire you have going from the headlamp back to near the ign.coi, isn't really long enough to reach the regular horn-location (without being extended with some added length),, so I'd suggest making use of it to pull-through a longer replacement, along with a White-wire for powering the ign.coil. _ This is a commonly-done trick used to add an extra wire to a wire-harness (with a conduit-sheath which can't more easily accept another/additional wire).
Also, on the newer Ducati-models, they broke the monotony of having more than one black-wire in the harness - (the taillight-wire became yellow, and the black power-lead to the horn & brake-light switch got a blue-stripe.
So when you pull-through the two new wires, besides a 16-gauge white-wire, the other wire then ought to be a 14-gauge blue & black (or plain-blue), ("14-gauge" so as to help a high-current horn to better sound-off).


" I`ve seen an Aprilia headlight switch for sale at several vendors. I know Classic Ducati in the UK sells one they say is for NC Monza. "

____ All the n-c.type key-switches & keys are a joke ! _ If you want a main-power/ign.key-switch which is significantly more secure than as a toggle-switch, then you ought to get a good-one which requires a REAL-key !


" They also sell a terminal block, but is that really needed ? "

____ It's only nice to have when fitting an original-headlamp WITH it's internal-wiring all getting connected-up to a STOCK wire-harness !
Otherwise, a stock terminal-block would serve you very little.


" The main part I've yet to find is the ignition key switch. I have the early Monza wire diagram that lists part #12 as
"Extractable 4 contact key ". Do you know where I could find this part ? "

____ Sorry, no,, but as I've indicated, IT's not a big-thing to go without. _ Other/better options can be had !


" The other parts I need look to be the warning lights. I have never seen an original Ducati like mine so I`m not sure what type light to buy or even where exactly they go. "

____ This particular topic has been fairly well covered (here at this w.site) before.
Have you not tried running a search for such here ?
I believe someone-else had found a fairly-good substitute which fits well enough.
Try running a search of the words 'indicator lamps' or 'warning lights', or some other combo there-of,, and you should find something on such the like.


" I have (besides the main switch hole) two holes of aprox 10mm and a smaller hole of about 6mm. "

____ One of the 10mm-holes is for the (red)- high-beam indicator, (the other a dummy), and I believe your 6mm-hole is for the lens located above the charge-flow bulb.


" With your help , once I have the right parts in hand.....I think I`ll be OK.
Now that I know what I have I`ve got confidence that I can make it all work ! "

____ I'm sure we can conclude that that's a double-affirmative !


Duke-Cheers,
-Bob

[averydad]

Hi Bob, I`ve been cruising ebay and found this listing 261035055553
Does this look like something I could use ? I don`t see a key....but security is not really that important to me.Simplicity and reliability and my main goal. I would seldom leave the bike unattended and could even wire a hidden kill switch if needed.
Thanks one more time. I apreciate the education and hope I don`t try your patience !
Rick

[DewCatTea-Bob]

" found this listing 261035055553
Does this look like something I could use ?
Simplicity and reliability and my main goal. "

____ I don't recognize that part,, although it could probably be somehow adapted to work for you, it couldn't be simply-done, AND look at that CRAZY-price! _ (Ya shouldn't pay more than 10 to 20% of that !)
So I'd say forget THAT.
__ When searching for such ign.switches, I suggest that you consider looking for them from ANY-other Italian-machinery as well.
____ When you decide to buy an acceptable key-switch, you should also have about three fuse-holders ready to install as well.

____ You happened to put-up your post while I was adding some extra wording to my previous-post...
Will you be okay with the added-effort of adding the suggested extra colored-wiring to your harness ?


" hope I don`t try your patience ! "

____ That won't happen so long as you can wait for me to respond at my convenience.
(Also I should mention that I still haven't gotten my internet-connection back at my summer-home,, and until I do, I may get left off-line (again) for an unknown amount of time.)


Hopeful-Cheers,
-Bob

[DanM]

The main part I`ve yet to find is the ignition key switch. I have the early Monza wire diagram that lists part #12 as "Extractable 4 contact key ". Do you know where I could find this part ?

Bevel Heaven and Syd's Cycles both have keys. Make sure they have the corrct one for your square headlight. I know they have the correct one for the round headlight cycles.

Dan

[DanM]

A 1966 square Monza headlight just came up on eBay. Looks pretty complete including a key. Item number: 180904520287

Dan

[Eldert]

a square headlight does not have a switch in it as we know but a switchboard

i think Ebay item 270790849851 is correct

Eldert