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Discussion Starter #1 (Edited)
I recently purchased aftermarket headlights from Ebay and installed them with no problem. However I noticed that neither of my front side markers worked while installing the new headlights. I tried to replace the bulbs but that didn't fix it. I cut the side marker sockets out of the wiring harness and tested them with a battery and realized the socket was fine. In order to remedy this I just spliced the side markers directly onto the turn signal wire. The side markers worked fine after that but now my headlights won't turn on...

The wire that I spliced the projector headlights to was the low beam. I've checked all of the fuses for my headlights and they are fine. I used a multimeter to check every single connection all the way up until the headlight socket and got a steady reading of ~ 12 volts. I've contacted the ebay seller's support team but e-mails back and forth are fairly slow. They recommended that I wire the projectors to the park lamp wire because too much voltage was being drawn into the low beam wire. I don't really think the cobalt has a wire like that so I wired it to the brown wire, which as far as I know is the daytime running light wire. Still no headlights though, I've tried replacing the low beam bulbs as well... but nothing has worked.

Here is a picture of what it looks like in case that helps.



EDIT: I drive a 2007 Chevy Cobalt LT
 

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You should look at the ground side instead each bulb left right high and low beam receive separate voltages from the fuse block. For all four to be out at the same time is impossible but ground is common to all 4.

 

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Discussion Starter #3
How should I go about testing the ground side of the connection? I'm still quite new to circuitry. Thank you for your quick response by the way.
 
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