73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Electrical => Topic started by: fordkilaz on June 13, 2013, 09:36:54 pm
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Ok this is gonna be a long one but I will start slow. The first problem I bought the truck with no motor or tranny so that being said I don't know what some wires are for. The first ones are there is a vacume line going to some wires on the fire wall near the heater box they are brown and a yellow wire. Then there is the same thing right behind the brake booster???? Those wires are 2 green's and a light blue. That's the first of the wire ?'s for tonight. Thanks.
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Sorry I should give some details about the truck. Its an 86 2 wd that had a 305 with od (700r4?) and air con
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- 1986 C/K Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_352_86_1986_Chevrolet_GMC_Light_Truc_Wiring_Manual_CK_10_30_Only.pdf)
- Forum Technical Library (http://forum.73-87chevytrucks.com/smforum/index.php/topic,25639.msg213706.html#msg213706)
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http://forum.73-87chevytrucks.com/smforum/index.php?topic=11766.0
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(http://www.freesmileys.org/smileys/smiley-signs138.gif)
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I cant find anything on there???
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take some pictures. sometimes people can look at a plug and tell you where it goes
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here are some pics http://s816.photobucket.com/user/fordkilaz/library/?sort=2&page=1
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The wires that are cut look like the water temp sender, the oil pressure sender, the oil pressure switch, and the carb fuel solenoid. They are shown on the right side middle of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg
The red wire probably goes to +12. I don't think any red wires connect to ground anywhere on my 78, not sure about your 86 but I would be surprised. That splice looks like the one on the right side of the same diagram just down from the top. That single piece of wire is the fusible link noted there, where a terminal that looks just like yours is connected to "JUNCTION BLOCK".
The black/white/green/brown connector I don't see in the diagrams. Someone else may know.
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Thanks Which wires are the oil pressure water temp and carb solenoid ?????
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Assuming we are talking about a 1986 truck:
This appears to be the distributor wire for the ESC, it should come out to the right side of the firewall and behind the firewall should be the ESC Box
(http://i816.photobucket.com/albums/zz90/fordkilaz/106.jpg)
Where does the other end of the wire go on this? It could be the Vac switch for a 700R4, or the Cruise Control
(http://i816.photobucket.com/albums/zz90/fordkilaz/107.jpg)
Where does this come out at? Straight out of the fuse block?
(http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpg)
If you trace the wires back to the fuse block you can find out where they go easily by finding which section it goes to and viewing the wires in that section here: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg (http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg)
This goes to the power distribution Junction block on the firewall, big diamond shaped block with 2 studs. Power come from the starter/battery terminal from here and powers the interior wiring.
(http://i816.photobucket.com/albums/zz90/fordkilaz/109.jpg)
This is a Blown through supercharged smallbock :D
(http://i816.photobucket.com/albums/zz90/fordkilaz/110.jpg)
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The vacume thing is pluged off the other end the wires go into the firewall, those wires come right out of the fuse block, and I found the last wire goes. The motor is a 421 rr 200 cnc brodix headed roller cam 4-7 swap vortech strim with a csu blow through carb which will be on the dyno some time soon I hope. That's why I want to find out these wires go I would like to use thee stock gauges and Im putting ac back on the truck. I just need to figure out how to wire the fans into the ac to get one fan to come on with the air.
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take a pic of the wires on the left of the vacuum switch. If it has a 2x2 plug is is for the trans.
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Thanks Which wires are the oil pressure water temp and carb solenoid ??? ??
These are: http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpg (http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpg)
And they are shown on the middle right side of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg (http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg)
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"Thanks Which wires are the oil pressure water temp and carb solenoid ?????"
These are: http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpg
And they are shown on the middle right side of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg
Ok I will and whick one the booster one or the upper one by the heater box???
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"Thanks Which wires are the oil pressure water temp and carb solenoid ?????"
These are: http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpg
And they are shown on the middle right side of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg
Ok I will and whick one the booster one or the upper one by the heater box???
I have no idea what you are asking here. In your picture you are holding a bunch of wires you say have been cut. The colors match the circuit diagram for the functions I noted. Looks like someone pulled an engine, and disconnected it electrically with a side cutters.
So what's the question?
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Ditto! I don't know what you are asking. We can't see in relation to pic exactly where you are talking about without guessing.
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Ok sorry I was asking about which one you guys wanted more pics of.
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Here are some more pics http://s816.photobucket.com/user/fordkilaz/library/?sort=3&page=1 The first pic with the vacume line and the third one is what Im trying to find out what they are.
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I already told you what they are....
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I already told you what they are....
????? I did find the oil and water and solenoid wires and marked them and the red wires that go to the blocl on the fire wall its the 2 vacume things like I have been asking. What are they??? http://i816.photobucket.com/albums/zz90/fordkilaz/002.jpg http://i816.photobucket.com/albums/zz90/fordkilaz/107.jpg
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Sorry, I thought you were asking about the third picture of the new stuff, which is the cut wires.
OK, I found some info on this other stuff. Has to do with Electronic Spark Control (ESC) as well as the lock-up torque converter. Here's the thread:
http://67-72chevytrucks.com/vboard/showthread.php?t=279479
And that four-wire connector is part of the same ESC system, that plugs into the distributor.
Here's the thread on how to lose the ESC:
http://www.73-87.com/7387garage/drivetrain/escrepl.htm
Given that you are going with a new engine and all, you can lose the ESC stuff. You may need the vacuum switch to lock up the torque converter depending on what tranny and torque converter you are using.
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Hey I just want to say THANKS!!!!! That's what I was looking for its all ecs and converter lock up shoot. Here is what Im trying to do. I'm putting in a th 350 with a blown 421 sbc. I wan't to use all the factory gauges and not the after market ones. I am tring to go for that stock look inside the cab. I am also gonna put the ac back on this truck and now Im tring to find the ac wires and some how tie them into the ele fans Im gonna use. I would like to have one fan come on when I turn the ac on. I think just tie into the clutch wire with a relay to the fan????
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Tieing into the clutch wire with a relay should work. You can use a two-circuit relay off the temp sensor to run the two fans, one on each circuit of the relay, then a relay on the A/C clutch wire connected to one of those circuits to bring one fan on with the A/C. This way the temp sensor can bring on both fans, but they are isolated from each other (not just wired in parallel) so that the A/C clutch connection only brings on one of them. That is, on one fan, you just have one side of the temp sensor relay, and connected to the other fan you have both the other side of the temp sensor relay plus the A/C clutch relay. If either one or both of those are on, that fan will run.
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Tieing into the clutch wire with a relay should work. You can use a two-circuit relay off the temp sensor to run the two fans, one on each circuit of the relay, then a relay on the A/C clutch wire connected to one of those circuits to bring one fan on with the A/C. This way the temp sensor can bring on both fans, but they are isolated from each other (not just wired in parallel) so that the A/C clutch connection only brings on one of them. That is, on one fan, you just have one side of the temp sensor relay, and connected to the other fan you have both the other side of the temp sensor relay plus the A/C clutch relay. If either one or both of those are on, that fan will run.
A very workable plan!
If I may expand the idea, instead of powering the condenser fan directly off the A/C clutch, think about running the control circuit of the 'condenser fan relay' (terminal 85 or 86 - depending on the relay selected) to the "power side" of the low-pressure cycling switch located at the accumulator. Then route the relay Common (terminal 30) through a fuse to battery positive and connect the N.O. relay terminal (87) to the condenser fan through a N.O. high-pressure switch mounted either directly in the compressor head or the high-side line. That way the condenser fan will run only when the A/C is switched ON and only when needed to bring the high-side pressure down. That is to say, the condenser fan will cycle ON only when needed, but also continue to run as long as the A/C is switched ON and the high side remains high for the few moments after the compressor has cycled off. The greatest advantage in this approach is that the condenser fan won't run unnecessarily during the cooler winter months when you're using the defrost mode. - Good luck with your project!
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That would work better then my plan I think Ill try that way. I don't plan on driving it when its winter but I would think just cold out would fog up the windshield. Ok 1 more ? is the small black vacuume line on the pass side fire wall isthat the line that feeds the vacuume for the heater ac controls???
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I am a little confused. I listed what those were on my original answer?
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[email][/emailOK sorry. Its a little black vacuum line that comes right out of the fire wall. no wires going to it just a line. OK so here is the ? what feeds the heater and ac controls with vacuum???
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OK sorry. Its a little black vacuum line that comes right out of the fire wall. no wires going to it just a line. OK so here is the ? what feeds the heater and ac controls with vacuum???
Vacuum is plumbed from the intake manifold, via a 7/32" hose, to a ~6" round, black plastic reservoir that mounts to the driver side firewall. The reservoir contains an integral check valve that keeps reservoir vacuum from bleeding off when the engine is accelerated hard or shut down. The vacuum line from the A/C control plumbs directly into this reservoir.
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OK sorry. Its a little black vacuum line that comes right out of the fire wall. no wires going to it just a line. OK so here is the ? what feeds the heater and ac controls with vacuum???
Vacuum is plumbed from the intake manifold, via a 7/32" hose, to a ~6" round, black plastic reservoir that mounts to the driver side firewall. The reservoir contains an integral check valve that keeps reservoir vacuum from bleeding off when the engine is accelerated hard or shut down. The vacuum line from the A/C control plumbs directly into this reservoir.
Ok in this pic the black round thing is what your talking about right above the tire..http://s816.photobucket.com/user/fordkilaz/media/001.jpg.html
Then is this pic http://s816.photobucket.com/user/fordkilaz/media/002.jpg.html is what the ball thing goes to its the small black line right above the ground cable in the pic.
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Vacuum is plumbed from the intake manifold, via a 7/32" hose, to a ~6" round, black plastic reservoir that mounts to the driver side firewall. The reservoir contains an integral check valve that keeps reservoir vacuum from bleeding off when the engine is accelerated hard or shut down. The vacuum line from the A/C control plumbs directly into this reservoir.
Ok in this pic the black round thing ("Vacuum Reservoir") is what your talking about right above the tire..http://s816.photobucket.com/user/fordkilaz/media/001.jpg.html ...
Yes
... Then is this pic http://s816.photobucket.com/user/fordkilaz/media/002.jpg.html what the ball thing ("Vacuum Reservoir") goes to - its the small black line right above the ground cable in the pic?
Yes - aka: "Spaghetti Line"
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Thanks for the help. LOL BD ("Vacuum Reservoir") sorry.
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;D
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Funny man bd :P. Ok I took all the ecs stuff out and marked all the wires I could that I know what they were. Took the vacuum things out on both sides. Now stuff is moving along pretty good here. I have some more wires to find out what they are I looked through the diagram's and could not find what I was looking for. So here goes it. There is a connector on the drivers side firewall that goes into the cab right below the fuse block. It has 4 wires 1 d blue with white strip, lite blue black strip, d green, and tan. Also there is a vacuum line that run's with it to the brake switch. I think it is all cruse control stuff???? Can I take all that out along with the vacuum line??? The vacuum line is not hooked to anything right now. I bought ( got it free) the truck with no motor or tranny. Just about time to get the engine to the dyno and then stuff it in the truck. I cant wait!!!!! Then I gotta do all the msd, boost controller, exhaust and then the dreaded fuel cell, fuel system. UGH.
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lol ford dont be so hurt my comment was deleted
(http://www.freesmileys.org/smileys/smiley-signs139.gif) (http://www.freesmileys.org/smileys/smiley-signs136.gif)
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... There is a connector on the drivers side firewall that goes into the cab right below the fuse block. It has 4 wires 1 d blue with white strip, lite blue black strip, d green, and tan. Also there is a vacuum line that run's with it to the brake switch. I think it is all cruse control stuff???? Can I take all that out along with the vacuum line??? ...
That's the cruise control harness. It seems to me a few members recently reported problems when removing the cruise wiring.
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So I should just tuck it away??? Just leave it in and not cut it out. Maybe I could use it for the trans brake button???? HMMMMMMM