There's small brushes available that you can get in there, but if you can't find any readily, (this is gonna take some fiddlin' on your part) try rolling up some 120 grit sandpaper with the grit to the inside and get over the pins. Don't work on it any harder than necessary to knock off the heaviest of the corrosion. Blow out anything you knocked loose and look it over. You could swab a little vinegar (it doesn't get sticky like Coke) in there after that and then hit it once more with a finer grit like 220, swab it out good with a little water and let it dry. From there, I'd put a little di-electic grease for each pin on the trailer end (male connector, female pins) of the plug, hook her up and check it out. I expect you'll see some improvement.
I use mine enough (7-flat and 6-round, lightly greased from time to time) that I don't have much problem with corrosion. My problem is usually the mud daubers makin' themselves at home in the six-pin on the trailer end. Must be somethin' about a round hole that draws them, they don't seem to bother the trailers with the flat-blade connectors.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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