Join Date: Apr 2008
Location: Proctor, VT, USA
The main issue to be concerned with is the in-line connectors between the regulator harness and the stator wires. They corrode and loosen causing a high electrical resistance to develop a local hot spot. A 1 ohm resistance will generate 900 watts of heat in the connector and adjacent wiring.
The resulting heat damages the wire's insulation, the wires short together, and this can cause the regulator internal circuits to be damaged. It's best to eliminate the connector entirely by soldering the wires directly. You need to use SWG 12 gauge wire between the engine case and the wiring of the R/R.
There's no reason to replace a functioning regulator.
However, the major reason why Ducati regulators fail is that full fairing bikes like the 916 don't provide enough cooling air, particularly when stopped. The solution for full fairing bikes is to relocate the regulator to a better air-cooled location outside the fairing.
I replaced my fifth failed stock 916 regulator with an Electrex RR51 and moved it to a location outside of the fairing and into the air stream. I extended the wiring and mounted it on the underside of the license plate holder facing the rear tire where it’s hardly noticeable.