2004 DL100. Newer battery which seems to hold a charge well. I have a volt meter on the bike. When I start riding the voltage output is 14-14.9 volts but as things get hot as in 80 degree weather/stop and go traffic, the voltage rapidly drops off 13...13.5...12.0....11.8... eventually to a dead battery. After things cool and the bike is started (pushed or battery jump) volt output is back up to 14-15 volts??? I'm thinking voltage regulator.