Headlight not working

Normally I always start by checking whether you have power at the wires to the light assembly. They can get damaged and there's nothing worse than doing a bunch of tracing to find it really was a broken filament all along. Same thing with the dash lights. I had a truck a few months ago which had a new dash installed a couple months prior. The dash lights went out and when I checked the problem, unbelievably but true, every single bulb was blown. Replaced the bulbs slowly, trying to stress them and basically get them to short or fail any way I could, turning them on and off, playing with the dimmer, shaking the wires, because I was so sure there had to be an underlying problem and the whole dash was going to short out again, but in the end it was really just the bulbs. Assuming you don't, go back and check your fuses and relays. Again, basic stuff, but quick and easy and not something you want to find out was the problem after hours of work.

 

pull the daytime running light fuse if you have one.

 

Was working fine till I messed with it..... story of my life haha.

test every single fuse with a test light. do not reply on sight, I've looked at a good fuse but found out with a test light it wasn't working due to bad corrosion or wear connection etc