What’s this and where does it go

[Mossyman]

For those that haven’t seen it…this is my 84 C10. It belonged to my grandfather and was given to me by my uncle a few years ago.

I haven’t cranked it in about a month and had to jump it off today. While waiting for the battery to charge I got to looking around the motor and there’s this plug that I have no idea what it is.

 

[RaisedK5]

I could be wrong, but from the location on pass side Id say air conditioning pressure switch.

Did it ever, or does it now, have a/c?

 

[Mossyman]

I could be wrong, but from the location on pass side Id say air conditioning pressure switch.

Did it ever, or does it now, have a/c?

It did at one time but it anymore. Looks like a lot of this and this that was removed from the engine compartment.

 

[PrairieDrifter]

I believe he's got it right.

 

[Bextreme04]

That's what the AC pressure switch plug looks like on my truck.

 

[73454GMC]

Looks like you have a manual oil pressure gauge installed. That connector went to an electric oil pressure/idiot light sending unit.

 

[73454GMC]

BTW...you should replace that nylon line with a copper one before the nylon line blows out and drains your engine of all its oil.

 

[Turbo4whl]

I could be wrong, but from the location on pass side Id say air conditioning pressure switch.

Did it ever, or does it now, have a/c?

That is a inline six, not a V8. Same plug was discussed several times. On a 6 cylinder the oil pressure switch for the choke is on that side.

@Mossyman Richard, In your picture you are hiding the colors of the wires. Does it have 2 blue wires and one more wire?

 

[Radiohead]

I'm leaning towards oil pressure switch too, the extra plastic doobiehickey isn't on the AC pressure switch, that I remember.