Originally Posted by mike837go
There is a relay in the Breakaway Battery Charging Circuit. When you turn the key off in your truck, Pin 4 is disconnected.
As with so many things, the answer is "it depends."
The factory 12v accessory jumper provided by GM under the hood of my chevy leaves the 12v lead hot whether keys are in the ignition or not.
I had this same conversation this past weekend, while camping, with my friend.
To prove it, I used a signal probe on the pin... and lo and behold! 12v with the truck just sitting there.
When the truck was purchased, I did not have 12v, and after searching the chevy forums... the GM techs told me where to find the factory pigtail that was still wrapped from factory, and where to plug it into the engine compartment fuse panel.
So, the correct answer would be: you should go check with a test light... you might be surprised.
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