Kia Troubleshooting Questions? Ask a Mechanic
Hello, was this problem the reason for changing the lights? Do you have a voltmeter handy to do some quick testing?
How much dimmer does the headlight seem? I mean is one yellow and the other white or something like that?
This rules out a bad ground or an issue with the fuse. I would say to check and make sure your bulb is set in the headlight assembly securely and the same as the other. Sometimes you can flip it upside down and it will fit but not be as bright. To be honest if it's not the problem then it's likely the aftermarket bulb itself has the issue. You may be able to return it and get a replacement. Being that it's not the original reason you replaced the bulbs, it's likely the bulb itself.
Please let me know what more I can do to assist you today. Also, please remember to rate my answer, Just Answer does not compensate me for my time and resources. Follow up questions are included in the price of your question. If you are using the free trial, or have a subscription a rating is still required.Thank you so much!