Andrew sent this pic of the finished item. Not bad eh?

Main battery cable to the starter motor sweeps down, to keep length short and make belt changing easy

Andrew had ferreted out a new tail light, plus four new indicators (rare as hens’ teeth). I decided to solder the cables onto the tail light contacts, rather than use flag terminals

ElectrexWorld regulator rectifier needed some small aluminium spacers to take up the 8mm holes in the frame bracket

Andrew’s Ducati 900SS

Andrew has owned this bike for many years – to the point where it needs a complete refresh. He’d already done the engine, frame and running gear. Next on the list was the electrics (and after that, paintwork).

You’d think a skinny V twin would be very simple, but in fact there’s not much room between the frame and the rear cylinder, so you have to figure out the best way to route the cables. I decided to do it Ducati Monster style, with the battery cables (and fuel lines) on the right, and the main loom on the left.

We discussed a few detail improvements: the usual high capacity battery leads and blade mini fuses, but also a Honda-style fusing system, a main relay to reduce the load through the tired ignition switch, and quick-release connectors for the front indicators, to make fairing removal easier. And it would be silly not to pop a new regulator rectifier on at the same time. Andrew got his from ElectrexWorld.

This was the year Ducati went all automotive on their 900: twin choke Weber carb, Fiat-type Magneti Marelli ignition. I hunted down some new ignition plug pins at Automotive Connectors.

It all worked out pretty well, and the bike fired up willingly. The alternator wires were a little tired, but they tested OK and charging was fine too. We even found that the low fuel warning light was working – something it had not done before! It’s great to see a cherished bike get a serious refresh.

“Thank you for all you have done to revive my Ducati wiring,” said Andrew after picking the bike up and finishing the last few jobs. “I am really pleased with all you have done, great job. The bike is now completely finished and is running really well.”

The main gubbins lives under the seat: Marelli ignition, fuse box, solenoid, diagnostic plug, flasher and main relays

And now with the seat unit on. The fuse box lid opens up inside the circle, just like the original

Lots of lights, with really obvious symbols to tell you what they do