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Just bought a 2000 f350 as a second work truck and need to tow my new dump trailer. Installed new break controller and 7 pin adapter on back of the truck (old ones were gross and corroded). Now All the lights work but breaks won't engage. Breaks didn't work with old controller and 7 pin. I know it's not anything to do with trailer, works just fine with my other truck. Thoughts???
I don't know about the older trucks, but I found 4 frame grounds on my 2018 F-150. If something electrical doesn't work, most of the time it is a bad ground.
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