Random Wire

[Boone83K10]

I have a random wire&plug just laying next to the fuse box. Everything on the truck works. The only thing that is gone is the "computer" that was cut out when the early 70s block was swapped in. That includes all the emissions stuff (EFE, EGR etc) Anyway here is the wire: PS. don't give me a link to wiring diagrams...

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Second question is how do you get the DUAL tank dash switch off? I can't get my big sausage fingers up there to get the clip, ducting and courtesy lights in the way.

 

[MrMarty51]

Do`nt know about the wire but,the courtesy light is held on by one screw,if I remember correctly and that duct that runs across it all I think has but one screw in it toooo.

 

[philjafo]

I'm not certain on the function of that wire, but in obd1 days not all of the diagnostic connections were in one neat little connection. So it could be a testing wire or it could be for an option that was not installed on your truck.

 

[89Suburban]

If we tell you what that wire is for we'll have to kill ya.

 

[Jims86]

That LOOKS like it may be a AC clutch activation wire for testing purposes.

 

[MrMarty51]

If we tell you what that wire is for we'll have to kill ya.

 

[Jims86]

Wait a minute, its a test wire for the Trans converter clutch...for lockup testing.

 

[bucket]

Wait a minute, its a test wire for the Trans converter clutch...for lockup testing.

Oh cool! Does that bypass the vacuum switch then? I wonder if an '84 has that.

 

[89Suburban]

Wait a minute, its a test wire for the Trans converter clutch...for lockup testing.

Cool, I can go test the L/U TC in the '89 now.

 

[MrMarty51]

Hook it to a switch,when pulling hills,turn on the switch,like shifting down a gear,add a bit more torque and might keep the transmission from shifting down to third.
I want to hook a switch to Mine TC lockup just for that purpose,but,I havent done any research to see if that might/would kill the sungears in the overdrive unit of My transmixer.

 

[HotRodPC]

I have the same wire and connector on the 85 K1500. I noticed it when I was playing with the fuse block while diagnosing power windows.

Would be good to know for certain what it is, and it's converter lock up and bypasses the Vac Switch on Pre TBI models, that would be cool. I ever get a 700r4 installed, I'd hook up a push button activation switch to that dude.

 

[Boone83K10]

this is an 83 with 700r4 so it could be it. I doesn't show up on any wiring diagrams which is why I asked.

The truck never goes above 55 up here so I don't know how well TC lockup works anyway.

 

[Jims86]

I would go at it with a continuity tester first, regardless of what the digrams say...you can follow it out of the firewall cavity. When my 86 was still oem, that connector was by the brake booster.

 

[Boone83K10]

it doesn't go out the firewall. It comes out by itself in a Y split that is still factory wrapped so I have no idea where it goes.


My real concern right now is the dual tanks. The AUX tank is completely empty, I flipped the switch with the key in the RUN position and the needle didn't even move. I assume that it didn't switch at all so I was going to start at the dash switch and work my way back to the tank. I've heard that if the selector valve fails then it defaults to the passenger side tank, well mine is on the drivers so that makes me think it is still good...just the dash switch is bad.

 

[Jims86]

it doesn't go out the firewall. It comes out by itself in a Y split that is still factory wrapped so I have no idea where it goes.


My real concern right now is the dual tanks. The AUX tank is completely empty, I flipped the switch with the key in the RUN position and the needle didn't even move. I assume that it didn't switch at all so I was going to start at the dash switch and work my way back to the tank. I've heard that if the selector valve fails then it defaults to the passenger side tank, well mine is on the drivers so that makes me think it is still good...just the dash switch is bad.

Yeah, that green wire has nothing to do with the tanks.