Go Back   Tech Support Forum > Automotive Center > Automotive Support

[SOLVED] 1988 gmc sierra - electrical

This is a discussion on [SOLVED] 1988 gmc sierra - electrical within the Automotive Support forums, part of the Tech Support Forum category. I have a 1988 GMC Sierra 5.7L 2WD. After replacing the battery 2 weeks ago, I went to drive hhome


Reply
 
Thread Tools Search this Thread
Old 11-07-2011, 05:10 PM   #1
Registered Member
 
Join Date: Nov 2011
Location: St. Louis, MO
Posts: 15
OS: vista



I have a 1988 GMC Sierra 5.7L 2WD. After replacing the battery 2 weeks ago, I went to drive hhome at night and noticed the dashlights were out. Come to find out that it was a blown fuse which included the instrument panel lights, the horn, and the parking llamps which was all on the parking lamp fuse. So I replaced the fuse, no problems. About two days later the fuse popped again. I have been told that this is most likely a short in a wire going to the tail liggts. The other possibility I've been told is the tail light circuit board (could be saying that wrong). Is there anything else I should check before I take apart 20ft of wiring looking for a short?

__________________
jb4e is offline   Reply With Quote
Old 11-07-2011, 08:38 PM   #2
Moderator Automotive Center
 
octaneman's Avatar
 
Join Date: May 2009
Posts: 2,723
OS: WINXP



Hi jb4e


When does the fuse blow ? Does it do it when you turn on the parking lights or when you press the horn ?

__________________



" What were dealing with is the battle between the future and the past, between the powers that were and the powers that have yet to be. " --- John Perry Barlow
octaneman is offline   Reply With Quote
Old 11-08-2011, 05:26 AM   #3
Registered Member
 
Join Date: Nov 2011
Location: St. Louis, MO
Posts: 15
OS: vista



Neither. It takes 2 or 3 days of use max before it blows.
__________________
jb4e is offline   Reply With Quote
Old 11-08-2011, 06:37 PM   #4
Moderator Automotive Center
 
octaneman's Avatar
 
Join Date: May 2009
Posts: 2,723
OS: WINXP



The problem is a bad switch or its connections somewhere within the tail light harness, the up and down motion of the car is causing the harness to make intermittent contact. Start off by examining the light sockets and its wires, look for corrosion and any broken connections then work your way to the switch. Do all of the testing with a DVOM set the meter for continuity and probe the ground side first, if you do get a reading on the meter start wiggling the harness until the break within the circuit happens. Take note of the positioning of your hands in relation to the meter to get a rough estimate of where the break in the wire is, open the harness up and repair it with a new connection using the same wire gage.
__________________



" What were dealing with is the battle between the future and the past, between the powers that were and the powers that have yet to be. " --- John Perry Barlow
octaneman is offline   Reply With Quote
Old 11-09-2011, 05:29 AM   #5
Registered Member
 
Join Date: Nov 2011
Location: St. Louis, MO
Posts: 15
OS: vista



That sounds about right. The last time it went out I was driving down my gravel road. Looks like I found my job for tonight. I will update results.
__________________
jb4e is offline   Reply With Quote
Old 11-11-2011, 06:39 PM   #6
Registered Member
 
Join Date: Nov 2011
Location: St. Louis, MO
Posts: 15
OS: vista



You were correct Octaneman. T was a bad connection where a previous owner added a trailer wiring harness. Connections have been replaced aand no blown fuse for 2 days now. Thanks for the help.
__________________
jb4e is offline   Reply With Quote
Old 11-11-2011, 09:09 PM   #7
Moderator Automotive Center
 
octaneman's Avatar
 
Join Date: May 2009
Posts: 2,723
OS: WINXP



Good job !

__________________



" What were dealing with is the battle between the future and the past, between the powers that were and the powers that have yet to be. " --- John Perry Barlow
octaneman is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
1991 GMC sierra
First of all it has a 350 V8 5.7L in their My main question is how to get the most gas out of it? any tips ? Upgrades? im getting 12mpg and its killing me!
cconner6156 Automotive Support 1 11-03-2011 08:47 PM
97 gmc sierra automatically changing to 4x4
anybody out here have this problem it happened to me 2 times#1 SEL comes on code states tranny gear component slipping remove code all is fine it happens when I am on the highway going 70 -- today out of the blue almost near home my truck decided it wants to go from 2 wheel drive and shift itself...
missmelissa Automotive Support 2 09-14-2011 09:07 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Post a Question


» Site Navigation
 > FAQ
  > 10.0.0.2


All times are GMT -7. The time now is 06:03 PM.


Copyright 2001 - 2014, Tech Support Forum

Windows 7 - Windows XP - Windows Vista - Trojan Removal - Spyware Removal - Virus Removal - Networking - Security - Top Web Hosts