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Author Topic: Connections I have no clue where it goes  (Read 9859 times)

Offline Pike1915

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Connections I have no clue where it goes
« on: May 20, 2016, 01:07:44 am »
I have a connection that I can't figure out where it plugs into.  The wires also have a lead that comes off it and goes to some sensor.


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Offline Captain Swampy

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Re: Connections I have no clue where it goes
« Reply #1 on: May 20, 2016, 06:03:04 pm »
What year? Does the sensor go in the head or exhaust? Maybe take another picture of the sensor.
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1987  350TBI 700R4  4X4  4.56 gears  33" BFG All Terrain


http://forum.73-87chevytrucks.com/smforum/index.php?topic=32209.0

Offline Pike1915

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Re: Connections I have no clue where it goes
« Reply #2 on: May 20, 2016, 06:45:15 pm »
1974 k10 350.  The sensor has a connection already I have no clue where the connection in my had goes
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Offline sbx22

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Re: Connections I have no clue where it goes
« Reply #3 on: May 20, 2016, 07:26:13 pm »
That looks like the alternator wiring harness.
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Offline VileZambonie

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Re: Connections I have no clue where it goes
« Reply #4 on: May 20, 2016, 07:32:46 pm »
pic is way too small
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline bd

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Re: Connections I have no clue where it goes
« Reply #5 on: May 20, 2016, 07:47:18 pm »
That looks like part of the Transmission Controlled Spark (TCS) modification that restricts vacuum advance operation to high gear.  Chances are there are components long missing from the system that are no longer available.  As long as you don't have to endure vehicle emissions inspections, leave it disconnected or remove the wiring entirely, along with its temperature sensor and relay, so as to leave no trace to excite suspicion. 
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline VileZambonie

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Re: Connections I have no clue where it goes
« Reply #6 on: May 20, 2016, 07:52:28 pm »
I'm glad you can see that lol
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline bd

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Re: Connections I have no clue where it goes
« Reply #7 on: May 20, 2016, 07:57:23 pm »
What?  You've never heard of Carnac the Magnificent?  lol  I doubled the image size to see blue and green wires and what I suspect, used to be pink. then surmised from there.  Really, nothing else made sense for the year.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline VileZambonie

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Re: Connections I have no clue where it goes
« Reply #8 on: May 20, 2016, 08:04:19 pm »
I did too and thought I saw a moth sitting on the manifold lol
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,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline bd

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Re: Connections I have no clue where it goes
« Reply #9 on: May 20, 2016, 08:37:58 pm »
Darn near fell out of my chair!  LOL  You're killin me Smalls.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Pike1915

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Re: Connections I have no clue where it goes
« Reply #10 on: May 20, 2016, 09:59:07 pm »



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Offline Pike1915

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Re: Connections I have no clue where it goes
« Reply #11 on: May 20, 2016, 10:00:13 pm »
It won't let me put big pics with my phone.  Is this pic better


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Offline Pike1915

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Re: Connections I have no clue where it goes
« Reply #12 on: May 20, 2016, 10:04:12 pm »
I do not have to have  emissions done on this truck.  I have one sensor on the right (passenger) rear of the block and a sensor on the  driver front of block.  Which one goes to temp gauge in cab.  I don't want to start ripping out wires if I need them.  I mean I wish I could just trash it all but can't 


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Offline bd

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Re: Connections I have no clue where it goes
« Reply #13 on: May 20, 2016, 10:47:46 pm »
The OE configuration places the temperature gauge sending unit in the left cylinder head between the #1 and #3 spark plugs and connects to the dash gauge through a single dark green wire. 

Take the time to verify the wires in question are what I think they are by comparing to the 1974 Wiring Manual (page 2) and the 1974 Service Manual (page 518).
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Pike1915

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Re: Connections I have no clue where it goes
« Reply #14 on: May 29, 2016, 09:48:34 am »




Here are a few more pics of the wiring
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