I've always replaced those flat plastic round pin connectors, thinking they were a little cheap and cheezy, with the big 7-pin Bargman type with the flat pins. However, it seems that just about every other time I hook up, something doesn't work. A little fiddling with the connector, scratching the pins and sockets with a small screw driver, etc. ususally gets the connection going. But I wonder if there is a better solution
I checked out a truck stop. The connectors that are sold
at that place all had round pins. I would imagine a fellow making his living driving an 18 wheeler wouldn't have much patience with a truck-trailer connector that had to be massaged every other time it was used.
Does anyone have a serious opinion on which is better, flat or round connector pins?