Homelite generator help

I just acquired an old Homelite EH 2500 generator. It's old enough, the gas tank sticker says not to use "gasohol". Looks almost new. 5 horse Briggs starts and runs fine. It didn't produce any power, so I flashed it using a drill. Drill runs fine on it. I plugged in the shop lights, no lights. Hooked up the drill, and with it running, the lights came on. Shut off the drill, lights went out. Any ideas?