98 TC. Cluster dims when running lights are headlights turn on

Vladimir2112

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Just had the dash pulled for the whole air box assembly. When I turn on my headlights on my running lights. My dash dims to about half. The dimmer functions and dims the dashboard. When the lights are off the dash is very bright .But can't be dimmed. So my dashboard lights go to half brightness when the lights are on. And our dimmable. When the headlights are off I'm at full brightness with no dimmability. Is this normal operation and I just never noticed? Or did they not hook up something or something broke
 
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