Electrical questions

[sjm44]

I am finishing up restoration on my 66 Ducati 250 single ( I think it was a Monza) and have some questions.
I will need to rebuild the wiring harness and wonder if anyone has a diagram that includes the color of the wires.
I need to find a source for the sealed beam headlamp that came with the bike. The bezel is the multi sided one, not the round one.
And on the top of the headlight shell, just behind the green light on the right side is another small hole. I don't know what goes in there. The parts manual shows something there but does not say what it is.

Thanks

Steve

[Ventodue]

I am finishing up restoration on my 66 Ducati 250 single ( I think it was a Monza) ... and wonder if anyone has a diagram that includes the color of the wires.

'ere you go, Simon. This is taken from the January 1966 owner's handbook for the 250 GT, Monza and Mach 1, btw (the diagram for the Diana is also the same).

Let me know if anything isn't clear.

Ciao

Craig

[Ventodue]

I need to find a source for the sealed beam headlamp that came with the bike. The bezel is the multi sided one, not the round one.

Like this? Being sold with a spare rim, too ...



http://www.ebay.co.uk/itm/1966-Ducati-D ... 1803wt_932

EDIT
Or, even better, a brand new one here:

http://www.ebay.co.uk/itm/Ducati-Bevel- ... _299wt_932

[JimF]

My '65 Mach 1 came with a socketed 25-W/25-W dual-filament bulb mounted in a reflector as opposed to a sealed beam. I also took note of all the original wires and colors as there was enough of the original harness left to do so.

This particular model had the battery, the large heavy black regulator and the 60 Watt alternator.

If you have a similarly wired bike I hope you find this drawing useful.

This drawing represents the main harness which covers the whole bike from front to back but terminates into a 8-position terminal block in the headlight bucket. From that 8-position bucket leaves a very short sub-harness that connects to the key switch, headlight bulb and indicator bulbs. I did not document that sub-harness as mine was perfectly intact from having been shielded from UV rays and inclement weather so there was no need to reproduce it.

The 8-position terminal block certainly allowed the headlight and its integral components to be quickly attached to the main motorcycle harness during the factory assembly process. For the 8-wires going in you can assume there are 8 identical colored wires coming out that go to the switches and lights inside the bucket.

There is no need to match the colors exactly as wires with colored stripes require special sourcing from electrical wiring restoration suppliers.

narrowcase.jpg

This matches the "Electrical Scheme" that Craig posted. Craig's copy depicts one wire whose color is in question; White was used for the wire.

[DewCatTea-Bob]

[quote= Ventodue ...
" This is taken from the January 1966 owner's handbook for the 250 GT, Monza and Mach 1, "

____ It seems that even after I'm long-gone, there will still be those who'll go-by that particular diagram-scheme, even though I've already pointed-out it's shortcoming at-least twice before.
Here's a link to the most recent time... viewtopic.php?f=3&t=1113&p=7571&#p7570
__ I'll have to check MY-OWN original owner's manuals to see for myself that any of them actually include this very-SAME diagram-scheme, because this-ONE that's posted (so far), contains an ERROR ! _ And anyone who connects-up the ign.power-wire to the key-switch as shown, WILL experience battery-rundown ! _ And the reason is because the ign.system will then draw it's power-consumption from a regulator-circuit (red-wire) that's meant to just monitor the battery, ONLY !
With the ign.system properly drawing it's power from the load-side of the regulator (gray-wire), the regulator will then properly-adjust it's charging-current to the battery & load-system !
__ I've now posted* a CORRECT-version of the earlier-posted diagram-scheme,
(* as seen directly BELOW).


DUCATIly,
-Bob

[DewCatTea-Bob]

[quote= JimF ...
" My '65 Mach 1 came with a socketed 25-W/25-W dual-filament bulb mounted in a reflector as opposed to a sealed beam. "

____ See pic of such posted below.
____ The sealed-beam employed for the USA-models was GE#4020, and is a 35/30w version,, but a 45/40w version (made for old jeeps [#4031]) will work fine as well.
Either 6-volt version ought-to cost under 20-bucks.



" This drawing represents the main harness which covers the whole bike from front to back but terminates into a 8-position terminal block in the headlight bucket.
From that 8-position bucket leaves a very short sub-harness that connects to the key switch, I did not document that sub-harness "

____ Too-bad that Jim didn't also include the proper connections to the 'key-switch' itself, within his nicely-done and otherwise complete "drawing" -(masterpiece) !
HOPEFULLY if he ever does do-so, he'll remember to indicate the CORRECT wires-to-switch connections !


Hopeful-Cheers,
-Bob

[sjm44]

Thanks to everyone with the replies, this should get me started on the wiring harness. I did see 6 volt sealed beams for old jeeps and other cars and wondered if they would fit. I will see if my friend at the local auto parts store would order one for me on a return basis if it does not fit. Not sure what the one that came in the bike when I got it was, but it did not fit well. The previous owner drilled multiple holes in the bezel to fasten it.

No ideas on the extra hole in the headlight shell yet.

Thanks again

Steve

[DewCatTea-Bob]

[quote= sjm44 ...
" this should get me started on the wiring harness. "

____ The stock-harness wiring was rather on the cheap-side,, while one or two of the wires are okay to be merely 18-gauge, others really ought-to be 14-gauge (if you stick-with a 6v.system).



" I did see 6 volt sealed beams for old jeeps and other cars and wondered if they would fit. "

____ They ought-to, IF your headlight-setup is the made for USA version.
__ Here's a link to a thread which you probably ought-to read-through. ... viewtopic.php?f=3&t=106&p=624&p625



" Not sure what the one that came in the bike when I got it was, but it did not fit well. The previous owner drilled multiple holes in the bezel to fasten it. "

____ That of-course doesn't sound-good at all ! _ Got any pix to show of that ?
__ The stock USA.version requires near half-a-dozen spring-clips to hold the sealed-beam in place.



" No ideas on the extra hole in the headlight shell yet."

____ Got a picture to show of it ?
__ It was somewhat common for past-owners to add a toggle-switch (for an added light or ign.switch).


Hopeful-Cheers,
-Bob

[sjm44]

Thanks again for all the information and diagrams. I tried to print the diagrams (easier then having the computer on the bench) but they all appear to be locked. They will not print with any the programs I tried. Any suggestions?

Steve

[Ventodue]

Well, that one I posted is only a jpeg, so try ...

Move the cursor on the image, right click, select 'Copy', and then paste it into whatever image management software you use - Paint, even. Then print from there.

(But don't forget to modify the diagram at the ignition switch 'cos otherwise Bob will get all perturbed and uppity again ... And we don't want the poor guy to have a heart attack )