2011 Yukon Denali Headlight ground issue

[RDEVans]

Hey all,

I have a 2011 GMC Yukon Denali that I believe is having a ground issue. Passenger side headlight works fine. Driver side was not working properly so I replaced bulbs, fuses, and relay. The headlight is still very dim on lowbeam and there is no high beam when I put on the brights. I’m guessing it’s a ground issue but looking for advice. And if it is a ground any idea where it’s connection would be at? Thanks!

 

[Big Mama]

More skilled folks will chime in but these rigs are known to have grounding problems. Check your ground connections at the chassis and engine block.

 

[Fless]

The first thing I'd do is verify what's low or missing -- ground or power -- and go from there. You could use a fairly high amperage test light (say, 4A or so) and test the connector terminals using a good 12v source, then a known good ground, and that would tell.

Or temporarily substitute a ground to see if that's the cause.