[ArmchairDucati]

Has anyone seen a wiring diagram (schematic) in color for a 1977 900ss?

 

[rick81mhr900ss]

All the original manual diagrams were black and white only. Why do you need one in colour?

 

[ArmchairDucati]

I am better at visuals and I don't like to squint at small lettering to see the wire color. I just colorized the Haynes diagram for myself and for others who my want it!

 

[flynbulldog]

Thank you, I saved that in my file for my 900SS

 

[flynbulldog]

You are new here - Welcome! would love to see pics of your bike.

 

[ArmchairDucati]

You are new here - Welcome! would love to see pics of your bike.

Yes, I am new here. Thank you. The 900ss is actually a customers bike I am restoring. I normally restore Norton and Triumph bikes, www.gekrestorations.com. He purchased the Ducati new in 1978 from EuroSport here in Portland Oregon. John Foysten rebuilt the engine a few yeas ago and I performed a cosmetic refurbishment, soda blasting the cases and polishing the outer covers, replating hardware, etc. The 900 has some period aftermarket parts the owner added in the late '70s. Here are a few photos of the progress. I am currently doing the wiring and need help with what's inside the headlight shell. Anyone have photos of the wiring there?

Thanks,
George

 

[ArmchairDucati]

A few more photos.

 

[Neil66]

Sorry I don´t have any wiring info but point to note is this is porn for the Ducatisti in these fora Keep posting the progress please👍

 

[rick81mhr900ss]

As the owner doesn't seem to be hung-up on original specifications, I'd strongly suggest simplifying the electrics and moving stuff out of the headlamp shell. I had an old 75 860GT that had a very cramped headlamp shell. My much newer 81 MHR only has the bulb in the shell, the blinky flasher solenoid is back above the battery, under the fuse box and there is no engine kill switch so no engine stop relay. There's also no headlamp flasher relay on later bikes; perhaps the switches were better at handling current.

Here's a scary picture of the 860GT headlamp shell (1975) (not mine)

 

[rick81mhr900ss]

some more stuff that may help:

 

[ArmchairDucati]

Thanks, both of these are quite a bit different than what I have. I have figured out what I needed to do and all in now good in that respect. The wiring harness I have is original to the bike and actually quite simple. Thanks for your help.

 

[rick81mhr900ss]

Simple is good! Please post more pics as the project progresses.

 

[ArmchairDucati]

Question please: Is this an Electronic ignition Generator, part #18 in schematic above? If so then I assume the orange (arancio) wire connects to the + power. I have an orange male connector on the main wiring harness that is not occupied.

 

[rick81mhr900ss]

My guess would be that this is an aftermarket engine stop relay; the little spring suggests that this is a mechanically assisted relay whereas the "ignition generator" is a simply another word for a coil. This would also explain the wire colouring. My guess would be that the black with the loop is ground, the two other blacks connect to the ignition transducer units and the orange is the live power from the handlebar/console switch; very easy to test. Later bikes had discreet coils for each head; I've never seen the single coil setup before. A pic of the coil below. Here's a really useful link for looking up parts and what they look like:https://www.ducaticlassics.com/parts/750-and-900-super-sport/all

 

[ArmchairDucati]

I have stock coils. The two sheaved, heaver wires are actually green not black, bad photo(!), and I think they go to the coil. Thanks for the input.