Thread: Holley 4150 Carburetor - Is this the vacuum and what is the 2nd electrical plug for?
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Old 03-29-2019, 09:48 AM
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TButtrick TButtrick is offline
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Yes, 12VDC to the bare terminal in your photo. Take a look at 1:45 in this video;

https://youtu.be/a81YNfOFVKg
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