Where does this wire go?

[Harmon]

This wire is on the drivers side under the hood, and has a long wire to the connector.  My truck is a 86 chevy that originaly came with a 305.
I do not have awire diagram and am trying to put back wires where they go as a few are not connected to anything.

Thank you.

[bd]

Does that wire become "green" as you trace it back toward the firewall?  It looks like oil and heat have beaten it up a little bit.  If it's the 'green' wire next to your hand, it probably connects to the water temperature sender for the dash gauge.

Look through the 81-87 wiring diagrams in our Technical Pages.

[81_Chevy]

looks like the temp guage sensor

[pholliday1]

x2 Temp sensor should be by drivers exhaust manifold

[77gmc]

I once had a 1985 very plain K10.   It had empty plugs all over the place for unused options.  I see there are wiring diagrams in the reference section here