Confused with 7 pin trailer connector
I do not understand what is going on with my trucks 7 pin connector. I have tested each pin by the ohm meter with someone in the truck working brakes/blinkers. It does not make sense. I had to put a new connector on my horse trailer. The problem is, the wires broke inside the trailer's connector so I can't tell what went where. But the truck side is not helping me figure out what to do.
Question 1. Isn't there supposed to be a pin that shows 12V only when the brakes are applied? I would assume this goes to the trailers brakes. There is not a pin on the truck that gets hot with brakes applied. Question 2. Isn't there supposed to be a pin that shows 12V when the lights are turned on truck? I would assume this goes to the marker/running lights on the trailer. There is not a pin that gets hot when lights are applied. Question 3. Why would the truck have 2 pins that show 12V at all times? All wiring diagrams I have read online only show 1 pin with a always hot 12V. Note - left turn, right turn, and brake lights work |
1 Attachment(s)
maybe this will help. if you have to use a batt to find what wire is what on the trailer.
no 12v on brakes would not work good. there is a 12v with the key on. yse the 12v with lights is running lights 1 is the brake controller the other is the all time 12v. |
Did you check the READ FIRST posts at the top of this FORUM??? There are wiring diagrams up there......http://www.ford-trucks.com/forums/59...0-13-10-a.html
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truck not behaving per diagram
Here is what is how the truck connector is behaving.
1. Ground - correct 2. Brakes - incorrect, always 12V. Shouldn't this only be when brakes are applied? 3. Markers - incorrect. Does not show 12V when the truck lights are turned on. Shouldn't this be 12V with truck lights? 4. 12V Aux - correct 5. turn/brake - correct 6. turn/brake - correct Could a relay or fuse on the truck be causing these symptoms? |
2. Your brake controller may be putting 12V on the plug to detect trailer brakes. Once it sees a circuit it would cut that power. What kind of brake controller do you have?
3. Check your trailer tow parking light fuse. |
2 and 3 reversed?
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Fixed it. Miswired trailer plug had blown fuse on truck effecting pin 3. Corrected trailer plugs 2, 3, and 1. Good to go now. Not a single wire color on trailer followed conventional color schemes. Nightmare.
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Never-ever go by color codes when two different manufacturers are concerned....ALWAYS go by applied voltages!
BTW....CONGRATS on figuring it out! Persistence always wins out! |
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