Wiring Schematics for 79~87 AND 88~90's? Chevy Trucks ?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-18-2007, 08:38 PM
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Question Wiring Schematics for 79~87 AND 88~90's? Chevy Trucks ??

Hey Y'all

I am looking for wiring schematics for the above years listed.

I need to know which wires can be removed to "old school" & remove the ECM in a 88 Chevy C~30 TBI Truck [was 454] to the typical "Big Dist HEI"

Installing a 78 , 400~ 4bbl from a C~30 Camper ,into a 88 Chevy Silverado 3+3 Camper Special 4 speed Dualie

I Don't want any electronic stuff ,some of the wires has already been butchered out.

1st owner had trouble with TBI removed it put carb on 454 installed a tank in the bed {did not use the saddle tanks}
Break failure {hydro boost}

down shift to stop truck......

BOOM !! Grenaded 454


2nd owner: rebuilt 454 ran for 1 hour motor knock ..removed motor & tank in bed & kept them. I have NONE of the BB stuff

So if possible I want to use all the factory gages (oil, water amps & gas )
And suck the gas from both saddle tanks from a mechanical fuel pump.

The Cruise & Wipers & Windows should be a cake walk I hope.

I was unable to "search & find" any previous threads on this type of retro conversion & I hope Ive stated enuf info.

I plan on putting a BB back into it later.


Any one done this before?

Thanks in advance for any help here

SR66
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Old 02-18-2007, 09:04 PM
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Doc here,

Go here, Schematic For your schematic.

I see no problems putting the older engine in the newer truck and stripping the Computer..You will be going carb, so no TBI is needed..the HEI should already be non computer compatible (if not, get a pre~1980 HEI)

Carefully unwrap the harness, and follow and remove the computer wires until you have the whole harness out, I see no BCM's involved for lights or instrumentation, (unless you have a digital dash) , so none of that should be a problem.

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Old 02-18-2007, 09:10 PM
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Thanks Doc

What do you suggest about the Fuel situation,
or should I post that in a different forum?

Do I need to Remove the pumps in the tanks &
will I have to add a pick up tube or replace the whole sending units?


SR66
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Old 02-18-2007, 09:21 PM
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Doc here,

If the duel tanks are in the truck now..(not sure if it was in the parts truck or in the new truck) Nothing electrically will change from the selector switch forward (unless you have duel gauges) but anyway, the senders should be the same..The pump will follow the sender select switch, so all that should stay the same..(I hope you see what I'm shooting for here..)

Mechanically , If it's in the non parts truck, you should be fine, If it is not, you will need to move the system to the non parts truck from the parts truck..

Simply put, If your going from a two tank truck to a one tank truck, no problem, If you have a one tank truck and want a two, you will need the system from the parts truck..

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Old 02-18-2007, 10:13 PM
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Got it! its the Dualie {with the 2 tanks} it seems {now} that the TBI was kinda like a add on idea so it should be not too bad to make it basically a 85 (like my Suburban) truck

I like fixing Spagetti as long as there is NO RUSH!

I thought it was a 85 till I got to the tag office

Seems like no biggie now Ill post back whan Im done{or if I have another problem}

Doc Vette
Thank You!


SR66
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Old 02-19-2007, 03:44 PM
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Doc here,

KEWL..Post back if you have any problems!

We'll finger it out...

Doc
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Old 02-19-2007, 03:58 PM
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EXCELLENT!





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Old 03-11-2007, 07:27 AM
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Doc Vette

How dose one go about "reading the fuse block"?

Simply put, the wires are color coated & go to a certain spot...

like
green/white to A-1

OK I got the Green white part but Where the hell is the A-1 ?

I can not seem to find a location that resembles a fuse block to save my butt.

Any Help is greatly appreciated



Thanks


R
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Old 03-11-2007, 05:04 PM
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Doc here,

Rob:

Look at the "line" of Connector Alpha's and Numbers..traditionally at the bottom or top of the line, will be a description of the item.

In the case you pointed out, A1 is The ECU (Engine control Module) as denoted by the ENGINE CONTROL MODULE at the bottom of the "Line" of Alpha's and numbers..

What that means to you, is go to the computer plug, look for pin A1 , then flip the backplane, and the wire will (Should) be green/white...AND the other End goes to the Fuel pump relay plug, Pin number there , is not given on the diagram, so it may be an independent connection, or you need to look at the connector to get the pin number for the green / white wire.

On a schematic, traditionally, when you have a line of pins or numbers and alpha's in a row, It is a connector, and SHOULD have it's function listed near it or in the notes box..

Another example:

Injector 1 has two wires, A blue and a RED..Follow those out, you'll Find the Red wire goes to the pink/black of the EGR solenoid, and changes color to pink/black, then on to the ECM 10 Fuse and pin A6 of the Engine control module..

The Blue wire goes to the Engine control module Pin D16..

Everything on that line of numbers is the Engine control module..

Does that help you?

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Old 03-14-2007, 06:56 PM
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Yes that gave me a boost.

I still had to trace out a few shorts ... a melted headlamp switch , a defective high low beam switch & lots of wires for the added on lights that were... ... ...

BUTCHERED! to be polite about it

Thank GOD for the Power Probe!!

All I have left is to figure out the wires for the internal regulated alternator & then its all over " 'cept for the looming "

here is some of the scraps I removed so far

Thanks Doc.


R
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Old 03-14-2007, 08:38 PM
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Doc here,

Man, what a mess! love to see those coming..$$$$$$.$$

Now is a GOOD time to install Headlight relays in the engine bay, and proper fuse links..had they been There before, that switch would be still looking at another 50 years of use..the brunt of the current would have been shunted by the relay contacts and links..only the relay coil would have been routed through the high beam, and headlamp switch..(about 1 amp isolated from the lights) ...even at a dead short.

Added bennie..the lights shine almost 3 times brighter...

Doc
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Old 03-15-2007, 08:49 AM
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I like the headlamp relay idea

I have some in stock will these work?
If so what goes where.{you can read the schematic from the pix}

Also I was going to put a fuse block in between the trailer wires .see any problems with that idea?

And the marker lights that were all shorted out I want to add to the turn signal circuit using the relays I have

I have 3 black relays & 2 red heavy duty flashers

I need to know what wire goes where I don't want to melt any of them



TOO KOOL!!

One Million Thanks DOC



R
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Old 03-15-2007, 03:43 PM
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Doc here,

KEWL!!

You have everything Except 10 gauge wire (which you need to replace with the old under gauge wire, and Fuse links OR Maxi's

Here is the schematic:



Here is the procedure:
  • Install your New headlamp switch as per normal as well as the HI/Low switch.

  • In the Engine Bay, locate (or install if burned out) your wires going to the high low beam headlamps..

  • Mechanically install your Relays out here in a dry place away from fuel, hydraulic, lines and rotating parts, securely mount them.

  • Cut and remove the wires going to the head lamps , replace them with 10 gauge wire..

  • The 2 wires Coming from the switch, (the other side of the headlight wires you cut) , determine which is low beam and which is high beam, each of these wires will go to terminal # 85 (RELAY COILS) of each relay. (one high, one low beam.)


  • RELAY COIL #86 = properly bonded , hard body ground. use star washers and burnish paint.


  • RELAY CONTACT #87 NORMALLY OPEN = (both relays) 10 gauge wire goes to a proper fuse link, then to the battery OR starter solenoid battery terminal.


  • RELAY CONTACT # 30 CENTER WIPER= (Both Relays) goes to the headlamps, One to high beam terminal, the other to the low beam terminals.


  • RELAY CONTACT # 87A NORMALLY CLOSED is not used for this application.


That's it..(unless I forgot anything!)

Tie your bundles up neatly and secure to the body/frame and your done.

Doc
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Old 03-15-2007, 04:01 PM
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chevy

seems like your a chevy guy would ya be interested in a**********

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Old 03-15-2007, 04:04 PM
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Doc here,

Post an ad in the Classified Section, these are tech forums, you'll get more views there!

Doc
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