NEW YORK—U.S. stocks finished lower on Tuesday, extending losses late as investors grew more jittery in the run up to third-quarter earnings, while a jump in Tesla shares helped support the market. Adding to investor caution, the Federal Reserve is expected to release minutes on Wednesday from its last policy meeting, which market participants will scour for hints about when the U.S. central bank could begin tapering its massive bond-buying program. All three major U.S. stock indexes ended in the red with the Dow down the most, weighed by healthcare and industrials. Earnings unofficially kick off this week with results from JPMorgan Chase & Co. on Wednesday and other banks to follow. JPMorgan’s shares shed 0.8 percent on the day, while the S&P 500 banks index edged down 0.6 percent. Analysts expect to see strong U.S. profit growth for the third quarter. But a number of companies have warned of …