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Old 08-08-2020, 07:27 PM   #1
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7 pin connection junction box wiring diagram

My left turn signal stopped working. Thought it was the bulb. well they are not bulbs, but a housing. So I decided to check that and all the bulbs work connected to a battery. I checked the truck 7 pin and I have power at the left turn/brake pin. So I decided to check the trailer 7 pin connections in the junction box mounted on the hitch. when I pulled the cover off and started pulling the wires out a couple of wire nuts fell off and the wires came apart. So I am not sure which wires go to which wires. Does anyone have a wiring diagram for the connection box for the 7 pin connector?
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Old 08-10-2020, 10:34 PM   #2
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There will not be a diagram for that wiring. Mine was all done wrong in that box from the factory new delivery. That included the brake wiring that was wrong. Your best bet will be a test light and tracing.
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Old 08-11-2020, 02:46 PM   #3
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I actually used my continuity meter and a 12V battery to test each wire and I think I have figured it out. I haven't actually hooked up the truck yet, but according to the 7 pin wiring diagram I have everything correct, and my left turn signal works, at least with the 12V battery.
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Old 08-15-2020, 01:13 PM   #4
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Junction Box Congested

Found junction box crammed full when doing disc brake mod. Went back with a larger junction box.
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Old 08-16-2020, 08:34 PM   #5
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Yes it is pretty crammed with wires. I backed the truck up and connected it and the left turn signal did not work after all that I had done. Pulled out the manual for the truck and lo and behold there is a separate fuse for the trailer left turn/stop light (20 amp fuse) and it was blown (truck lights still worked). When I originally tested the truck 7 pin I must have tested the wrong pin. I've always been if the truck lights work the trailer lights should work. Learned something new. The fuse blowing is still a mystery, slight chance it was because the wire nuts had come loose, so all my work was not in vane. Only time will tell.
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