Rebuilding 77 f150 and I am trying to figure out where a 6 pin rubber plug runs to. Colors are yel/blk, blu/blk, blk/yel, red/blk, Brn, grn and they are all large conductors (12 ish gauge). The plug is located near brake booster and I’m having trouble finding it in Haynes manual. Can anyone tell me what these wires feed?

 

Look up each wire's colors on this & the NEXT several pages. After a few wires, you should notice the same system being mentioned in a few of the possible functions - that's probably the system it's for.

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But if you post pics of it, and where its wires go, we might be able to guess.
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