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2020 Duramax keyed 12v power source

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3K views 3 replies 3 participants last post by  kmart78 
#1 ·
I’m getting ready to install some air horns and need a switched 12v power source, anyone point me in the right direction?? I’m hoping for somewhere under the hood or on drivers side dash.
 
#2 ·
Try going to gmupfitter.com and look through the manuals to find the electrical diagrams you need
(y)
 
#3 ·
Where F27/28 is ... there are 3 terminals ... fuse only has 2 holes ... leave current fuse on center and right pin, which leaves 12v outlets on constant ... remaining pin will be key hot ... connect lead of your new fuse holder out to your accessories.
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#4 ·
Awesome, thank you!
 
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