Loose wires (was voltage regulator wires)

[nwguy]

I'm about to try starting my 99 Bassa after 2 months of restoration. I didn't document where the brown wire in the pictures below goes from my voltage regulator. It has a ring terminal on the end which I assumed it was a ground, and bolted it to the engine block. Before I start this up, I want to determine if I did the right thing. The wiring diagram I have for a 2000 Jackal shows different colored wires, none brown. Do I have this right? I don't want to fry anything.








Note that there is what appears to be a ground wire coming from the regulator's right side mounting hole that leads to the under side of the coils.

[Tom H]

Hopefully you get a better reply.

I would not try to start it with the brown wire to ground.

The wire to ground from the regulator mounting hole was a common add on to insure the regulator was grounded.

If I was you, I would go to Benders site and look through the wiring diagrams for bikes of your type and see if any have matching wire colors. You only included a little snippet of the diagram. The brown wire is going somewhere, you need to see what else is connected to it. Also the snippet shows a blue wire that you don't have. Again, I would brows the wiring diagrams.

Not much help, just didn't want you frying something.
Tom

[Kiwi_Roy]

Im with Tom H on this.

Here is the drawing of 2000 Bassa
https://www.thisoldtractor.com/guzzi007/schematics/2000_Bassa.gif

https://bruceshark.com/products/rrv-a076?currency=CAD&variant=42718984339610&utm_source=google&utm_medium=cpc&utm_campaign=Google%20Shopping&stkn=9c135addbacb&gad_source=1&gad_campaignid=19937935116&gbraid=0AAAAAB8bS6AcsbWusughFNqPeLibCrV2j&gclid=CjwKCAjwvO7CBhAqEiwA9q2YJW53G5ugrBF4wgu1vwWD78dRQImMyCdlamVexOhBnQLt9seZo7xeChoCjAoQAvD_BwE

UPDATE JUNE 25 10:30 PM
The Brown wire on your drawing seems to be in the same place as the red/black on this drawing which is the headlight feed you don't want to ground that.
If the bike has a Ducati Energia Voltage regulator the Red/Black is actually +12 Volts from the headlight relay the regulator needs that to power it's electronics, it also provides a Voltage reference telling the regulator when the battery is at correct Voltage level, I used to have a schematic of this regulator I drew from one i was able to pull apart.
The light blue wire goes to charge light on the dash.

The Ducati Energia regulator does need grounding th current returning to the alternator passes thru chassis from battery negative, a bd ground will cause the battery voltage to be off.

[Wayne Orwig]

1. Can you get a better photo of all of the wires on the RR?

2. Does your dashboard have a generator light?


Somewhere in there they changed to a regulator that had two yellows from the rotor, two ground wires, had two fused HOT wires, no dash light. But I thought that was around 2003. So that is confusing.

[nwguy]

Turns out the brown wire's ring terminal is just behind a frame tube such that I can't fit an allen wrench or an allen socket into it, so I must not have removed it previously. I'm going to leave it in place and add a ground wire from the regulator to the frame as advised.

I do have a loose black wire with a fork terminal coming out the wiring harness leading to the ECU that I don't remember disconnecting. There's a very similar black wire in the same location bolted to the ECU. I measured ohms from the loose black wire to the frame and got a non-zero reading, so maybe not a ground wire. I don't see any likely places it could bolt to except where the similar wire is bolted to. See the loose black wire shown with the red arrow below, and the similar black wire bolted to the ECU shown with green arrow.





Roy, I have been referencing the wiring schematic you suggested. Today I found the owner's manual to a California Special Sport (2001 May) with a wiring diagram on the last page:
https://www.thisoldtractor.com/mg_manuals/owners_manual_california-special-sport_2001-05_it-en-fr-de.pdf

Lastly I found a loose plug end shown below with a red arrow without a matching plug. I don't think it's related to lights on the rear fender since I labeled and reconnected all of them. Its wires are red/black, and dark blue, which matches the color of the wires on the bigger plug that's used with an electronic petcock. Mine's a manual one. Are there 3 plugs that go the electronic type petcock?

At this point I'm think I'm going to try starting it with that black wire loose and the mystery plug not plugged into anything and see what happens.










Thanks for all your thoughts, and again sorry for the brown wire confusion.

[Kiwi_Roy]

Re Ground strap.
I discovered the importance of this in my early days with a VII Sport. if you don't get a good ground the battery Voltage will be low, the charging current returns to the Alternator vis chassis.
I have often suggested using a strip of Aluminium with a hole at each end run from mounting bolt to  one of the timing cover bolts
That way it's similar metals all the way rather than a possible electrochemical cell to corrode. Of corse apply some type of grease e.g Vaseline