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Click on image for the lowdown. 
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| | | Forums66 Topics128,077 Posts1,055,928 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | What year truck? 55-59? Here is a photo of a unit with no light but it has a tab. I'd say that tab is for grounding (but the unit could also ground through the socket to the dash). I have used a similar unit on a 6v and 12v 1954 truck and did not connect a ground wire to the tab. One of my units had the bulb fitting and lead. | | |
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