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electrical plugs at rear of fame

1K views 2 replies 3 participants last post by  oldeerslayer 
#1 ·
what the electrical plugs at rear of fame, not tail lights
 
#2 ·
There are ground splices at the rear of the frame, black and green plastic things... not plugs though.
 
#3 · (Edited)
Some trucks had a trailer plug back there, but it doesn't actually fit any common trailer connectors. It's some odd GM 7 wire or something. I usually just use a Tee adapter into the junction inside the left frame rail for standard 4 pin light duty trailers. My old 97 Blazer had one.
Got a good pic of it?
 
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