Why Do Some 7-way Plugs Use Dual Contact Surfaces

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Question:

This is a follow-up question to the Bargman question I asked on about April 16th, 2019. Please reference pictures included. The molded plug end of the blue cable # 54006-059 I received SEE TYEE BB is different from the plug end sent to be installed on the wire end of the cable SEE TYPE AA. The referenced prepared cable double ended 8’ long #50-67-210 with the two 2 molded ends appears to have on both ends, the same type of plug. SEE TYPE BB-This is a guess as I can barely make out the cable ends. I’m confused ? Please explain the difference between the “pinch” connectors on one end and.the “blade” connectors on the other end.

asked by: Robert

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Expert Reply:

A 7-way (female) vehicle socket like # PK12-707E has a single blade contact; these fit in between the dual contact surfaces in a (male) trailer plug like # 54006-059, # 277-000143 or # A10-7W10 and the connector (type BB) shown in your photo.

Some 7-way male plugs will use a single blade contact, such as the plug on Hopkins 7-way extension # HM20049. This item's female socket and male plug happen to both use the single contact. Both types are compatible with each other.

The Bargman Double-Ended 7-Way Molded Trailer Connector # 50-67-210 has two male ends and happens to use the dual-contact plugs on both ends.

click to enlarge

expert reply by: Adam R

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Why Do Some 7-way Plugs Use Dual Contact Surfaces

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