Welcome to 2CarPros.
You have a ground issue. Power is back feeding (trying to find a ground) through the indicator in the vehicle. That is also why it is dim on the outside.
If you take a look at the attached picture, it shows where the primary ground is located as well as a splice in the wiring. I circled both. Either the main ground is bad or there is a problem with the splice. Something is causing power to not flow to the selected ground.
Let me know if this helps or if you have other questions.
Take care,
Joe
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Saturday, October 12th, 2019 AT 10:44 PM