6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > Interiors, Dash, Lights and Electrical


Interiors, Dash, Lights and Electrical Everything Inside

Reply
 
Thread Tools
  #1  
Old July 17th, 2021, 01:32 AM
motolover motolover is offline
Junior Member
 
Join Date: Nov 2019
Location: tottenham, Ontario
Truck: 1966 gmc c1000
Age: 28
Posts: 6
Rep Power: 0
motolover is on a distinguished road
Default Wiring rats nest

The previous owner really hacked up the wiring in my 66 gmc. I am a novice when it comes to wiring but I was wondering if anyone could point me in the right direction as to where the 2 purple wires that are twisted together go? Also it looks as if I am missing the tab in the bottom right of my fuse panel for a fuse to snap into?.
Attached Images
File Type: jpg 20210716_201335.jpg (2.84 MB, Multiple views, 17 clicks)
File Type: jpg 20210716_201506.jpg (4.33 MB, Multiple views, 16 clicks)
Reply With Quote
  #2  
Old July 17th, 2021, 04:01 AM
Funky61's Avatar
Funky61 Funky61 is offline
-= Dues Paid =-
 
Join Date: Jan 2013
Location: Corona, CA
Truck: 1961 Suburban 1962 GMC Utility
Posts: 1,129
Rep Power: 409
Funky61 is just really niceFunky61 is just really niceFunky61 is just really niceFunky61 is just really niceFunky61 is just really niceFunky61 is just really nice
Default Re: Wiring rats nest

Here is a 1965 schematic from the Jolly Disc that might help.

Neutral Safety Switch, top right, shows two VIOLET wires but only for automatic transmission

* I see that light Green wire is an add-on and not a color on the schematic color key

That is my guess and I hope someone else will chime in...

Good luck and let us know how you did.

__________________
1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D

Last edited by Funky61; July 17th, 2021 at 04:15 AM.
Reply With Quote
  #3  
Old July 17th, 2021, 09:57 AM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 432
Rep Power: 199
James will become famous soon enoughJames will become famous soon enoughJames will become famous soon enough
Default Re: Wiring rats nest

That missing tab goes to your dome/tail light. Do they work?
Reply With Quote
  #4  
Old July 17th, 2021, 11:45 AM
motolover motolover is offline
Junior Member
 
Join Date: Nov 2019
Location: tottenham, Ontario
Truck: 1966 gmc c1000
Age: 28
Posts: 6
Rep Power: 0
motolover is on a distinguished road
Default Re: Wiring rats nest

The dome light is not hooked up and I have the box off so I have not been able to hook up the taillights. It has an automatic transmission, I am also fiddling around with the turn signal switch as my original one was bad so I had to get one from a 63 chevy that would work. I am trying to figure out that color wire on the 63 turn signal does what.
Reply With Quote
  #5  
Old July 17th, 2021, 01:40 PM
lizziemeister'sV6 lizziemeister'sV6 is offline
-= Dues Paid =-
 
Join Date: Aug 2013
Location: Strawberry Point, Iowa
Truck: 1965 Suburban Series 1000 - 351M with mechancal tachometer - PS & PB & 2 speed Pow-R-Flow automatic
Age: 70
Posts: 227
Rep Power: 135
lizziemeister'sV6 will become famous soon enoughlizziemeister'sV6 will become famous soon enough
Default Re: Wiring rats nest

Bad news - GMC and Chevrolet turn signal switch are not alike - they are numerous differences between the GMC and Chevrolet trucks built prior to the early 1970's. Don't reply on much help from parts vendors and assembly manuals that lump GMC and Chevrolet together - My advice is to save everything you can from your wiring such as ends/terminals and scout around and find parts/pieces of ORIGINAL to your truck and go from there. The aftermarket part sources are junk - think China.

Last edited by lizziemeister'sV6; July 17th, 2021 at 01:46 PM.
Reply With Quote
  #6  
Old July 17th, 2021, 09:52 PM
AZKen's Avatar
AZKen AZKen is offline
Senior Member
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,605
Rep Power: 513
AZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really nice
Default Re: Wiring rats nest

1. The missing fuse and holder terminal is for a spot light. That's why it says "SPOT LP". It's common for that to be "missing" if not RPOrdered. Your tail light/stop-dome fuse is in place.
2. If you want to know how to hook up the turn signal wires, advise the colors coming out of the switch.
3. The neutral safety switch wires (violet) look like someone was bypassing the switch. One vio wire from the switch goes to the solenoid via the 6 pin firewall connector on driver side. The other vio wire goes to the ignition switch solenoid terminal. Switch is probably bad. That's why the bypass.

Does the truck start?

You only have one other issue, that was almost 2 years ago. (454 swap)

Last edited by AZKen; July 18th, 2021 at 05:01 AM.
Reply With Quote
  #7  
Old July 17th, 2021, 10:44 PM
motolover motolover is offline
Junior Member
 
Join Date: Nov 2019
Location: tottenham, Ontario
Truck: 1966 gmc c1000
Age: 28
Posts: 6
Rep Power: 0
motolover is on a distinguished road
Default Re: Wiring rats nest

The problem i am having with the turn signal is trying to figure out that color wire goes where. The new switch i got has different color wires than the factory ones. And I can say putting the 454 in has definitely made things alot more difficult
Reply With Quote
  #8  
Old July 18th, 2021, 12:20 AM
AZKen's Avatar
AZKen AZKen is offline
Senior Member
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,605
Rep Power: 513
AZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really nice
Default Re: Wiring rats nest

Please read the posts carefully. Read no. 2. Tell me what the colors are!!!!!!!!!!!!!!!!!!!!!!!!!!! Coming out of the 1963 switch that you have.
Can you please give me the part number and vendor of the turn signal switch you bought.

Please answer the underlined part above. DOES THE TRUCK START ? We can't help if you don't give us info. We don't know anything about the situation until you tell us.

We CAN get you wired if you answer the questions.

ALSO: Do you need help with the 454 install?

Last edited by AZKen; July 18th, 2021 at 02:45 AM.
Reply With Quote
  #9  
Old July 18th, 2021, 03:14 AM
motolover motolover is offline
Junior Member
 
Join Date: Nov 2019
Location: tottenham, Ontario
Truck: 1966 gmc c1000
Age: 28
Posts: 6
Rep Power: 0
motolover is on a distinguished road
Default Re: Wiring rats nest

The switch was ordered from classic parts part # 53-507.
The wire colors are yellow, light blue, white, dark blue, pink, and purple.
Yes the truck starts and runs right now, the 454 purrs like a kitten.
Reply With Quote
  #10  
Old July 18th, 2021, 04:27 AM
AZKen's Avatar
AZKen AZKen is offline
Senior Member
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,605
Rep Power: 513
AZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really niceAZKen is just really nice
Default Re: Wiring rats nest

1. YEL- to flasher L
2. DBLU- RH front park/turn
3. WHT- Brake switch input
4. LBLU- LH front park/turn
5. Pink- LH rear turn/stop
6. VIO- RH rear turn/stop

The above matches 1963 Chevy wiring diagram and 1963 GMC diagram. There may be small changes made to 1966 wiring. But now you know what the switch operates so you can trace your truck wires to see where they go and hook them to the switch wires per my info. The colors may not match your truck wiring.
Looking at the wiring diagram that funky posted and assuming it is the same for 66 GMC and assuming your wire colors in the truck are original, I figure it would wire like this below:

To wire the 1963 Classic Parts switch 53-507 to your truck: (not 53-507A)

1. T/S switch YEL to truck VIO
2. T/S switch DBLU, LBLU and WHT......same as truck
3. T/S pink to truck YEL
4. T/S VIO to truck DGRN

You will have a black wire in the column for horn. It is DGRN on earlier trucks. Does not need to go thru T/S switch.
You may also have a gray wire for automatic transmission column indicator light. Does not need to go thru T/S switch.

Please be sure to check my info before energizing anything. To double check, check by function not color. I.E. tracing truck wires.

Other members may see it differently. So give it some time.

As I said, the NSS has been bypassed by twisting the two VIO together, that's why is starts.
The light green and dark green wires on the NSS are for the back up lamps.

Last edited by AZKen; July 18th, 2021 at 11:44 PM.
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wiring Archiver Previous Forum Posts 0 December 5th, 2005 12:34 AM
wiring Archiver Previous Forum Posts 0 February 18th, 2005 04:11 AM
Wiring Archiver Previous Forum Posts 0 July 25th, 2004 07:49 AM
Re: Wiring Archiver Previous Forum Posts 0 October 28th, 2001 01:38 PM
Wiring Archiver Previous Forum Posts 0 October 28th, 2001 08:05 AM


All times are GMT +1. The time now is 06:55 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 671711554703|1710438950|0