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What is this harness plug?

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Old Aug 31, 2025 | 08:25 PM
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MTurner2003's Avatar
MTurner2003
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What is this harness plug?

Can anyone tell me what this harness is for and why it is plugged/capped off? Last picture is where it traces back to at the firewall.

If I knew what it was called I would have tried searching first, lol.

Thanks in advance!

1977 F350 CS w/ 460 and C6.



 
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Old Sep 2, 2025 | 06:02 AM
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Hard to say with only the close up of the plug .
You might be able to figure it out through the color code in the wiring diagram.
(search the "Ford truck information and then some" sticky at the top of the forum.


 
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Old Sep 2, 2025 | 10:43 AM
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I looked at a 78 wiring diagram. It looks like egr vacuum solenoid.

https://www.fordification.net/tech/i...ster_4of10.png

Connector C-330 and or c-331 appears to have same shape and wire colors. You can see what the connectors look like on the bottom and sides of the diagram. It is in the wiring diagram upper right.
 
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