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08 Trailblazer SS. Low beams go off when I switch to high beams?

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    Welcome to Motor Vehicle Maintenance & Repair.Your question is not clear.can you please elaborate bit more – DhKo Sep 20 '17 at 14:01
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    Low beams are supposed to go off in all vehicles when switching to main beam. What exactly is your question? – Chenmunka Sep 20 '17 at 14:06
  • lows don't always go off... mine stay on as they are the outer ones. – Solar Mike Sep 20 '17 at 14:14
  • Low beams stay on on my vehicle with H4 bulbs – r.anderson Sep 20 '17 at 14:30
  • It depends on the bulb type, design of the lighting solution as well. Low beam uses a separate bulb and high uses a separate bulb in the 2008 Chevy TB. When engaged to high, both should remain 'on'. There is an underlying cause preventing this function. – Numair Aidroos Sep 21 '17 at 10:56
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It is probably the bulbs you are using. Low beams should be dual filament. If you are using single filament (or circuit for led) they will turn off.

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