1977 Chevy K20 - Under-Hood Electrical Components Identification - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-16-2011, 01:05 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
1977 Chevy K20 - Under-Hood Electrical Components Identification

Hi All,


I need some assistance in identifying some electrical components that are located on the passenger-side fender of a '77 Chevy pickup. (Image posted below).


If the members could please identify what these components are, and what it is they do, I'd greatly appreciate it. I have gone ahead and marked each component alphabetically so please use those when responding. (My apologies if this should have been posted in the Basics section).


Thanks in advance


Attached Thumbnails
Click image for larger version

Name:	Unknown Parts_Passenger-Side Fender.JPG
Views:	2595
Size:	469.8 KB
ID:	58988  

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-16-2011, 01:19 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: Newton county Ga
Age: 70
Posts: 143
Wiki Edits: 0

Thanks: 8
Thanked 10 Times in 8 Posts
a and b are fuses. c looks like a residental ac contactor.
d and e are relays like used for Ford starter solonoids. When power is put to term. s power can go in one side and out the other at the big terms. Might have been a rig tio isolate batterys but thats just a guess. It looks more of a hazzard than any thing and if you have no use for it Id say remove it all.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-16-2011, 01:46 PM
Bryan59EC's Avatar
Car? Truck? Who Cares
 

Last journal entry: First week of December
Last photo:
Join Date: Jun 2006
Location: San Antonio, Texas
Age: 54
Posts: 2,370
Wiki Edits: 0

Thanks: 2
Thanked 28 Times in 22 Posts
Yep----nothing that the factory put in at all

could be something that was added for a working truck, or municipal truck with Public address systems, light bars, or to power any sort of added equipment.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-16-2011, 02:02 PM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: Newton county Ga
Age: 70
Posts: 143
Wiki Edits: 0

Thanks: 8
Thanked 10 Times in 8 Posts
Another fuse is in the blk. square on yell. wire below c and d. I agree with the man abiove def. not factory!
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-16-2011, 03:18 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
Here is another one:








Hey gonefishin' and Bryan59EC,

Thanks for the helpful responses. I'm not surprised that none of this is factory.


The truck has all kinds of wires and things running all over the place. Apparently one of the previous owners modified it with the intention of making it an off-road toy/hauler. This truck's got a got a CB radio with a PA system, two sets of fog lights, a connector in the rear bumper for the towing/camper lights, cruise control, an amplifier and speakers, and a radarthat doesn't seem to work, and a hoard of swicthes on the inside.

I sure wouldn't mind getting rid of the extra stuff, just need to figure out what needs to stay.


Attached Thumbnails
Click image for larger version

Name:	DSC04852.JPG
Views:	2384
Size:	347.9 KB
ID:	58997   Click image for larger version

Name:	Electronics,Tile.jpg
Views:	2479
Size:	626.4 KB
ID:	59002  
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-17-2011, 07:33 AM
Registered User
 
Last photo:
Join Date: Oct 2011
Location: Newton county Ga
Age: 70
Posts: 143
Wiki Edits: 0

Thanks: 8
Thanked 10 Times in 8 Posts
When taking it all back off the big thing to watch for is any place that he wired into the stock harness or stock wiring. You seem like a smart young man and if you take your time and take notes as you work I think you will have no probs.

Id want to say to disconnect this mess from the batt. first before start taking it all out so no shorts will melt any thing.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-17-2011, 02:56 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
Thanks for the words of encouragement as well as the helpful ideas!

Aside from installing stereo equipment from scratch, I've never done any serious electrical work, so this will be a nice learning project for me. It should be easier to do this on an older vehicle than a newer one.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-17-2011, 03:53 PM
EOD Guy's Avatar
Registered User
 
Last photo:
Join Date: Aug 2010
Location: Alabama
Posts: 2,109
Wiki Edits: 0

Thanks: 1
Thanked 143 Times in 133 Posts
Do you have an HEI dizzy? (Coil in the cap)
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-17-2011, 04:01 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
Hey EOD Guy,
Quote:
Originally Posted by EOD Guy
Do you have an HEI dizzy? (Coil in the cap)
Yes, the truck has an HEI.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-17-2011, 04:31 PM
EOD Guy's Avatar
Registered User
 
Last photo:
Join Date: Aug 2010
Location: Alabama
Posts: 2,109
Wiki Edits: 0

Thanks: 1
Thanked 143 Times in 133 Posts
If memory serves me right:
Green wire to the dizzy for the tach if equipped
Wire from the key switch (switched 12 volt) to the dizy and the module plug (not sure but most of the time people don't mess with those wires)
Purple wire from the key switch to the small post on the starter (engages the starter soleniod)
A large cable from the battery to the starter
Large red wire from either the starter terminal or the battery to a factory splice that splits off to the horn relay, the fuse box main feed and the alt
A small brown wire from the ing switch/ alt light to the alt
Green wire to the horn relay
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 10-17-2011, 06:39 PM
EOD Guy's Avatar
Registered User
 
Last photo:
Join Date: Aug 2010
Location: Alabama
Posts: 2,109
Wiki Edits: 0

Thanks: 1
Thanked 143 Times in 133 Posts
As far as those extra parts....... if the guy had a camper etc...... he might have used those to pwr an inverter..... bottom line I'd document what they were hooked to, if it's a light, horn, or what looks like a compressor for a air horn, I'd get rid of them..... go back to some sort of OEM setup..... if something doesn't work after the removal, consult your notes and diagrams and ask here....we'll get ya straight. Might be easier to get rid of all the crap and start over with what you want to put back..... ie... fog lights etc..

Last edited by EOD Guy; 10-17-2011 at 06:44 PM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 10-18-2011, 02:44 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
Quote:
Originally Posted by EOD Guy
If memory serves me right:
Green wire to the dizzy for the tach if equipped
Wire from the key switch (switched 12 volt) to the dizy and the module plug (not sure but most of the time people don't mess with those wires)
Purple wire from the key switch to the small post on the starter (engages the starter soleniod)
Below is a picture of the wires running to the distributor.

In the picture on the far right, the big tan/brown cable is the one from battery I believe.

The green one probably runs to the tach, as you mentioned.

Not sure on the blue wire yet. It might be the purple wire you were referring to that runs from the key switch to the small post on the starter.






Quote:
Originally Posted by EOD Guy
A large cable from the battery to the starter
Large red wire from either the starter terminal or the battery to a factory splice that splits off to the horn relay, the fuse box main feed and the alt
A small brown wire from the ing switch/ alt light to the alt
Green wire to the horn relay
I just replaced the cable from the battery to the starter this Sunday. I will try to trace down the rest.




Quote:
Originally Posted by EOD Guy
As far as those extra parts....... if the guy had a camper etc...... he might have used those to pwr an inverter..... bottom line I'd document what they were hooked to, if it's a light, horn, or what looks like a compressor for a air horn, I'd get rid of them..... go back to some sort of OEM setup..... if something doesn't work after the removal, consult your notes and diagrams and ask here....we'll get ya straight. Might be easier to get rid of all the crap and start over with what you want to put back..... ie... fog lights etc..
I think I will start by documenting everything first, including labels, pictures and diagrams. I will also to try to locate the stock wiring schematics. probably a good idea to buy a Haynes or a Chilton's manual. Here are a few that I found on Autozone's website.

Body Control Diagram - 1977-79 Vehicles





Body Control Diagram, continued - 1977-79 Vehicles





Engine Control Wiring Diagram - 1970-78 Vehicles






Thanks for the continued help!
Attached Thumbnails
Click image for larger version

Name:	Distributor Wiresl_Tile.jpg
Views:	2342
Size:	215.7 KB
ID:	59026   Click image for larger version

Name:	Body Control Wiring Diagram - 1977-79 Vehicles.gif
Views:	7205
Size:	80.1 KB
ID:	59027   Click image for larger version

Name:	Body Control Wiring Diagram, continued - 1977-79 Vehicles.gif
Views:	8273
Size:	111.8 KB
ID:	59028   Click image for larger version

Name:	Engine Control Wiring Diagram - 1970-78 Vehicles.gif
Views:	6939
Size:	108.8 KB
ID:	59029  

Last edited by lt1silverhawk; 10-18-2011 at 02:48 PM. Reason: More info added.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 10-20-2011, 03:59 AM
EOD Guy's Avatar
Registered User
 
Last photo:
Join Date: Aug 2010
Location: Alabama
Posts: 2,109
Wiki Edits: 0

Thanks: 1
Thanked 143 Times in 133 Posts
Keep us posted on your progress
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 10-21-2011, 08:22 PM
lt1silverhawk's Avatar
"But how do it know?"
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto... Last photo:
Join Date: Mar 2010
Location: Lakewood, CA
Posts: 2,287
Wiki Edits: 132

Thanks: 101
Thanked 24 Times in 17 Posts
Quote:
Originally Posted by EOD Guy
Keep us posted on your progress
Will do! Its gonna be slow progress due to other priorities (and 'cause I'm a pansy whose afraid of shortening something out), but I will definitely report back as I progress. Many thanks for the interest, help and support!
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 10-22-2011, 05:58 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by lt1silverhawk
Will do! Its gonna be slow progress due to other priorities (and 'cause I'm a pansy whose afraid of shortening something out), but I will definitely report back as I progress. Many thanks for the interest, help and support!
Nah- you are right to be cautious. If you disconnect the battery before you get into it (after ID'ing the wires w/a meter or test light, where needed) there won't be any chance of shorts. But I think you're joshing more than anything.

BTW, tried to nominate you for a job here, although MY nomination might be more like the kiss of death, given the reputation I've been given. Post #25. I should mention, there have been some other good, knowledgeable guys here who were asked by the mods to participate- and they (wisely?) declined. And others who were asked- and when they accepted- were turned down anyway. So there's little rhyme/reason to this, other than I believe what I said in the link above and stand by it.

Last edited by cobalt327; 10-22-2011 at 06:10 AM.
Reply With Quote Quick reply to this message

Tags
electrical, eletrical hazard

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for 250 six electrical components 63NovaBoy Engine 1 10-17-2006 09:20 PM
1977 Chevy L6 w_rios Engine 2 03-23-2006 07:47 AM
92 chevy 350 components Eric64 Engine 2 03-09-2006 01:18 PM
my 1977 chevy luv chevyluver1977 Introduce Yourself 2 08-30-2005 01:24 PM


All times are GMT -6. The time now is 09:40 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.