Wiring diagrams

Chuck

Sr. Member
Joined
Nov 24, 2006
Messages
158
Likes
0
Points
16
Location
Billings, MT
#1
Please fill out the following to ask a question.

MAKE: GMC
MODEL: Suburban
YEAR: 1990
MILES: 236653
ENGINE: 5.7L
DESCRIBE ISSUE....I need the wiring diagrams so I can find out why it has no dome lights or horn and the horn fuse blows out instantly.
 
Joined
Nov 14, 2006
Messages
4,747
Likes
43
Points
48
Age
117
#2
no time to explain right now-
I think dome and horn same fuse SO
remove horn relay - does the fuse still blow?
yes - ck cig lighter
no - then advise me as another diagram needed

Dome lights - front and rear inop?
Glpve box llight ?

Sorry GTG
 

nickb2

Wrench. Diagnostic Tech.
Joined
Nov 22, 2008
Messages
8,388
Likes
126
Points
63
Location
St-Hyacinthe, Quebec, Canada
#3
Ok, me being the asshole I like to be, if that fuse is blowing instantly, short to ground, don't pass go and collect 200$

You wanted a wiring, you may not like it. Horn is not on dome light circuit. So mostly a bad wiring job, or a fuse block problem. Cig lighter is on horn circuit, start there, dome light is another issue.

See ace 0 pdf.
 

Attachments

Joined
Nov 14, 2006
Messages
4,747
Likes
43
Points
48
Age
117
#4
was busy this morning and had to run -
I saw this for fuse box and posted about possible same fuse let us know, these older models are a PIA for getting good diagrams.

Also do the underdash entry lamps come on when door opened OR headlight switch turned full bright ?

double check that lighter - anything plugged into that or ALDL ?
 

Attachments

Last edited: