How to Test 7-pin Trailer Plug with Multimeter?
2 people – one to run the vehicle and one to run the multimeter; Replacement Light Bulbs (Optional) Sandpaper (Optional) Electrical Contact Cleaner (Optional) The configuration of the 7-pin Trailer Plug. The 7-pin trailer plug is complicated because it hosts 7 different connections all in one (watch the video right below this paragraph).
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