7 pin plug
I have a 2004 chevy 2500 hd duramax allison The 7 pin plug does not transfer 12volt to the trailer plug (both the rear or the in box plugs are the same) is their a fusible that has to be added some w...
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This means that if you insert the tap the wrong way round, the device you are powering from the tap won't be protected by the fuse
....also a very important point! This Post/thread should be made a sticky....
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