A300
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Rejected Takeoff; Flight Crew Returned To Gate; General Maintenance Action
Aircraft; Weather
During takeoff roll; Generator 2 fault. Takeoff rejected between 90-100 kts. Generator 2 reset during deceleration (with no crew action).  While exiting runway; Generator 1 faulted. Generator 1 would not reset. Suspected water had entered avionics area and returned to Maintenance area to have avionics compartment inspected. Water was found in the generator contactor area. Both generator contactors replaced. Rain was falling during loading. No water noticed in crew entry area prior to block out.
After calling 80 kts I lost all my screens on my side with a Gen 2 failure. We heard a lot of clicking noise on the overhead panel. The Captain rejected. We performed the procedure and told Tower. As all this was happening we got Gen 2 back and lost Gen 1. We performed all associated checklists including rejected takeoff checklist. We returned to the gate for maintenance. They replaced parts and we started over.
A300 flight crew reported rejecting the takeoff and returning for maintenance after experiencing anomalies affecting both generators. The problem was traced to water in the avionics compartment.