Unknown Unplugged Wire

[Michael Moore]

I recently found this wire that is unplugged behind the distributor. By looking at it seems it's been unplugged for a while. I can't find anywhere for it to plug into. Could anybody tell me what it might be? I tried to take the best pictures that I could.

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[chipskittles]

What year is your truck? My 94 has a similar plug up closer to the MAP sensor but it's a two prong plug that would take a male weatherpack connector. Don't know what it is either. Sorry I can't be of more help.

 

[RichLo]

Does your truck have a tachometer? If not, it could be for a factory tach that was never hooked up. Its in the right spot for that.

 

[Michael Moore]

What year is your truck? My 94 has a similar plug up closer to the MAP sensor but it's a two prong plug that would take a male weatherpack connector. Don't know what it is either. Sorry I can't be of more help.

My truck is a 91

 

[Michael Moore]

Does your truck have a tachometer? If not, it could be for a factory tach that was never hooked up. Its in the right spot for that.

That sounds likely. It doesn't have a factory tach Just one that I added.

 

[skylark]

Is it a tan wire? It is in the correct location for the est wire for setting base timing of the engine. As I recall it is a tan wire with a black stripe.

 

[deejaaa]

looks like the glow plug connection.

 

[Justin S]

I think some of those trucks have an extra wire for an 02 sensor if it had the option. I believe @Dylan1991_1500 's truck has the same plug open, and his is also a 91

 

[Dylan1991_1500]

Yeh, I believe that is an o2 sensor wire. Most likely your truck was switched to a heated 3 wire o2 sensor so it no longer uses the 1 wire sensor.

 

[Michael Moore]

Is it a tan wire? It is in the correct location for the est wire for setting base timing of the engine. As I recall it is a tan wire with a black stripe.

No. I know it's not that wire because I know where it is. It's to the left of this picture.