So I was going to go for a drive in the 2011 GMC 1500 at 4am but when I started the truck, no low beams. High beams work. Separate bulbs. Now what. Google says that sometimes
when one bulb goes the other goes in sympathy. Who knows when they went out.
Did some testing. The connector that plugs into the bulb had 12 volts. The bulb showed open circuit implying that the bulb is gone. Replaced one bulb and it worked. Can't get the other bulb out of the headlamp assembly
so have to remove the whole assembly. That will be in a couple days. Other things to do.
Got it though
Jim