It depends, what year is your bike?
The reason that early 748's and 916’s only operated one headlight at a time is that the charging system wasn't designed to run two 55 watt bulbs simultaneously. 1995–1998 superbike models were designed with a 350 watt 2-phase electrical system. For the 1999 model year, Ducati redesigned the charging system going from the 350 watt 2-phase design to a 520 watt 3-phase alternator.
The early bikes had a lot of regulator failures. The problem stems from an electrical system design that includes a charging system of marginal capacity that results in constant high electrical demands on the components to maintain an adequate charging rate. The weakest link is the regulator. The problem is compounded by faulty stators, poor electrical connections, small-gauge wires, and inadequate cooling of the regulator itself.
The best, but expensive, solution is to put a HID light in the high beam side. HID's draw less power but are three times brighter than the stock units.
[Edited on 3-9-2005 by Shazaam!]
Shazaam!
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