[rattlsnak]

OK, I have a prewired/lighted xmas tree that ive had for a few years, well this year a section of lights in one of the middle strings is not working. This string has about 50 lights on it, and about 30 in the middle are out. I replaced about 10 of them so far before i had to leave. They were all blown, but still none of them work. I can take one of the blown ones, put it inline in a string that works, it of course it still wont light, but all the others do. Im getting ready to break out a voltmeter, what volts should i be looking for and how to check? In series? ACV? with the bulb in or out?