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Voltage regulator woes

R

radan2

Just got it firing!
Joined
Oct 27, 2008
Messages
13
About a month ago, my '07 Breva 750 stopped working. The EFI light had come on, then in a short time everything stopped. The problem was diagnosed as a failed voltage regulator. My mechanic at Backroads Motorcycles (where I had bought the bike) diagnosed the problem as a faulty voltage regulator and ordered another one.

When the new one came in, the wiring to the various plugs did not match the old wiring (based on insulator colors). It was sent back. A second one came: same problem.

I talked to Thierry at Piaggio, who was very polite and called me back promptly. He said they are trying to get guidance from Italy about whether we need to rewire the plugs for the regulator. So far, no input. Several people have said that the worst that could happen if I plugged in a regulator incorrectly wired would be to blow a fuse, but others have suggested I could fry my entire electrical system. I have even heard of some people who say that the wiring codes in the diagram are incorrect on their bikes.

Anyone else have this problem? It is now coming up on a month without my Guzzi, and I am suffering from severe withdrawal. I have even bought a backup--an 89 BMW r100gs bumblebee. It's a nice bike, but it ain't my Guzzi. :(
 
Update: Harper's is sending a correctly-wired voltage regulator! O frabjous day! Caloo! Callay! :woohoo:
 
Did Harper’s have to rewire it correctly or are there two different batches? That is, correctly wired one and incorrect ones?
 
I assume the voltage regulator is at the front of the engine. If so it is an excellent position for picking up road dirt. I had one fry because the earth wasn't working any more. The two different metals (steel tag and aluminium body) will set up a mild battery effect and create corosion, add the road dirt and that's it in time.
Since then I have always run an extra earth from the regulator to a convenient engine bolt. Seems to have worked so far, I regularly check the resistance of the earth now.
 
Patrick, what year was your bike with the bad ground?

My V7C came from the factory with the regulator already grounded to the battery neg at the engine casing.
 
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