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 December 8th, 2021, 08:38 PM
thenonoman thenonoman is offline
Junior Member
 
Join Date: May 2020
Location: Russellville, Arkansas
Truck: 1965 C1000
Age: 45
Posts: 20
Rep Power: 17
thenonoman is on a distinguished road
Default High Beam Indicatator

65 1000. My high and low beam headlights work, but when I am on low, the high beam indicator in the dash lights up, then turns off when the high beams are on. I replaced the dimmer switch because it was pretty chewy anyways, but the problem persists. I don't see any obvious hackery in the wiring. Before I spend hours going cross-eyed with the wiring diagram, is there anything obvious or easy that I am overlooking?
Reply With Quote
  #2  
Old December 8th, 2021, 09:36 PM
AZKen's Avatar
AZKen AZKen is offline
-= Dues Paid =-
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,319
Rep Power: 407
AZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the rough
Default Re: High Beam Indicatator

You have the indicator bulb wired to the low beam. Can you tell me if you have been messing with any wiring? How long has this been happening? Any splicing done? Any connectors messed with? With those questions answered, I can try to tell you where it is mis wired. Most of the circuit is thru prewired connectors so hard to miswire that part.

FOR NOW: There are three terminals on the dimmer switch. With three wires. One is hot from the light switch. It would be the terminal with two rivets. Confirm it is the hot terminal. Leave that wire alone and swap the other two wires and test. That should not change anything, but we can start there.

Next, confirm that high beam is all headlights on and low beam is outer headlights only. Report.

Last edited by AZKen; December 8th, 2021 at 09:55 PM.
Reply With Quote
  #3  
Old December 8th, 2021, 10:23 PM
thenonoman thenonoman is offline
Junior Member
 
Join Date: May 2020
Location: Russellville, Arkansas
Truck: 1965 C1000
Age: 45
Posts: 20
Rep Power: 17
thenonoman is on a distinguished road
Default Re: High Beam Indicatator

I have only owned the truck for two years, most of which has been spent building and installing the engine. I have driven it less than 200 miles, and the only wiring I have done is to replace the tail light loom, clean the fuel tank sender, and replace the dimmer switch.
I will do what you advise and report. It will be a few days though. Thank you for weighing in.
Reply With Quote
  #4  
Old December 9th, 2021, 06:38 AM
AZKen's Avatar
AZKen AZKen is offline
-= Dues Paid =-
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,319
Rep Power: 407
AZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the rough
Default Re: High Beam Indicatator

Was the hi beam indicator ever working correctly?
Reply With Quote
  #5  
Old December 9th, 2021, 02:23 PM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 67
Posts: 322
Rep Power: 139
James will become famous soon enough
Default Re: High Beam Indicatator

I would suspect the engine bay wiring harness was tamper with in it past. The connector on the firewall (5 pins connector) or the connector on the radiator support (2 pins connector) may have two wire swapped. Check the color on the wire on both side of the connector (they should be the same) and match them up.

Just guessing, I would suspect the connector on the radiator support is wired backward (mostly likely cause by doing maintenance around the radiator or body work). Located below the horn.
Reply With Quote
  #6  
Old December 9th, 2021, 09:44 PM
AZKen's Avatar
AZKen AZKen is offline
-= Dues Paid =-
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,319
Rep Power: 407
AZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the rough
Default Re: High Beam Indicatator

Agreed, the two pin is the main suspect..... or the wiring after the two pin, possibly. As I said, it's hard to screw up connector wiring unless splices have been done. I.E. connector eliminated and wires butt spliced. You never know what previous owners have done.

At/after the radiator baffle connector, the light green wire is four-ganged to all headlights. The tan wire is routed to driver outside headlight, then to the passenger outside headlight. Incorrect colors may have been used, so be aware of that.

If you get stuck, post some good well lit pics of that connector and the wiring.

Last edited by AZKen; December 9th, 2021 at 10:00 PM.
Reply With Quote
  #7  
Old December 9th, 2021, 10:09 PM
thenonoman thenonoman is offline
Junior Member
 
Join Date: May 2020
Location: Russellville, Arkansas
Truck: 1965 C1000
Age: 45
Posts: 20
Rep Power: 17
thenonoman is on a distinguished road
Default Re: High Beam Indicatator

Quote:
Originally Posted by AZKen View Post
Was the hi beam indicator ever working correctly?
I drove it at night for the first time since I bought it a few weeks ago and noticed the problem. I checked the lights before I bought it, high and low beam, but did not notice the indicator. I was outside checking the lights, signals, running lights, and brake lights.
Reply With Quote
  #8  
Old December 10th, 2021, 01:39 AM
AZKen's Avatar
AZKen AZKen is offline
-= Dues Paid =-
 
Join Date: Jul 2014
Location: AZ
Truck: 6066GMC
Posts: 1,319
Rep Power: 407
AZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the roughAZKen is a jewel in the rough
Default Re: High Beam Indicatator

Understood. You will find it with the info given. Let us know when you get a chance,
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
Re: how to troubleshoot - high beam indicator Archiver Previous Forum Posts 0 April 13th, 2009 05:09 AM
high beam indicator - update (working) Archiver Previous Forum Posts 0 April 13th, 2009 02:19 AM
high beam indicator - not working - how to fix? Archiver Previous Forum Posts 0 April 12th, 2009 04:12 AM
Re: high beam indicator - not working - how to fix? Archiver Previous Forum Posts 0 April 12th, 2009 02:19 AM
Re: how to troubleshoot - high beam indicator Archiver Previous Forum Posts 0 April 12th, 2009 02:17 AM


All times are GMT +1. The time now is 11:27 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 841642258942|1641119278|0
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2022 DragonByte Technologies Ltd.