How to Determine if Trailer 7-Way is Upside Down for Determining Pin Out

Updated 01/12/2026 | Published 03/03/2020

Question:

The explanation of what terminal controls which function in a seven pin plug by Michael H. is very helpful. i.e. one oclock hot lead, 3 oclock right turn/brake, etc. My problem is that I have a 2014 Silverado and GM has flipped the socket on the truck. Does that mean that the explanation given by Michael is flipped as well? Meaning one oclock is now 5, 3 oclock is now 9, 5 oclock is now 11, etc?

asked by: Paul B

Expert Reply:

I attached a picture of a 7-way wiring diagram for you to check out to help show you where all of the pins of the connector are. If your 7-way is upside then yes the diagram would need to rotate 180 degrees. You can use the notch of the 7-way to determine if this the case. The square notch is normally on top of the connector so if yours is on the bottom then it is inverted.

expert reply by: Jameson C

click to enlarge

Marc

1/9/2026

Hello,this inverted plug was asked earlier,mine notch is also facing down.with the notch facing down,the ground wire is connected to the post at the 5 o'clock location viewing it from the back of the plug.is this correct?I took a photo but can't post it.ps am I gonna get charged for this? Thanks marc

Jameson C.

1/12/2026

@Marc It sounds like you have a standard 7-way that is just upside down. If you wanted to send me a picture you would have to email it to me at [email protected]. We do not charge for this service either!