No Running Lights!

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
One orange wire should go from headlight plug to the fuse box, another would branch off to the cigarette lighter and another to Convenience Center if so equipped, whatever that would be. You need to trace that second orange wire and see exactly where it goes. Or at least unplug the cigarette lighter power feed from behind the socket and see if it still heats up.
 

DuallyGuy

Full Access Member
Joined
Aug 17, 2012
Posts
63
Reaction score
1
Location
San Fernando Valley, California
First Name
Matt
Truck Year
1973
Truck Model
GMC C15 1/2 Ton Stepside
Engine Size
5.7L 4BBL 350 V8
Ok. Will do. I know that the cigarette lighter does work. So in other words, there shouldn't be two orange wires going into the circuit behind the light switch?
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
According to that diagram I posted there could be 2 wires. Trace the second mystery wire. or, cut it off and see if the main wire still heats up. We want to narrow down the source of the short.
 

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
This is the closet thread to my issue. I have no rear running lights. Everything else works. T/L CTSY fuse looks good (im gonna try a new one just to be safe). Where all could the issues be? I think I read somewhere about grounds coming off? is that pertinent to this?
 

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
Ok seems like I have power at the rear plug. Gonna check bulbs....any suggestions on locations for issues in the back end of the wiring?
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
Ok seems like I have power at the rear plug. Gonna check bulbs....any suggestions on locations for issues in the back end of the wiring?

Do you have a tow harness? Take a continuity tester and check the sockets for good ground to frame.
 

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
I do have a tow harness. I disconnected the harness and using a volt meter on the plug coming from the front of the truck I'm only getting 9v on the brown wire
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
I PM'd you my number if you want to call. I got to do some things and get off the comp.
 

chengny

Full Access Member
Joined
Feb 22, 2012
Posts
4,086
Reaction score
1,023
Location
NH
First Name
Jerry
Truck Year
1986
Truck Model
K3500
Engine Size
350/5.7
Low voltage in a single circuit:
 

Attachments

  • low voltage.jpg
    low voltage.jpg
    107 KB · Views: 487

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
Low voltage in a single circuit:

Jerry after a few phone calls he has power to the rear. Had him unplug the harness at the firewall and run a jumper from the battery to the brown wire pin. He's got a home made test light. Says there is power to the brown wire in the back of the truck. He doe not have a multimeter. This is screaming a ground issue in the rear to me. He has an aftermarket "T" plugin tow harness and has added a 3 light ID running bar light under the tailgate that is grounded to the bed. Do you know where the bed to frame ground strap and rear harness to frame ground wire connections are for my neighbor here to locate and inspect? It's a bit cold outside and he is struggling lol. Hang in there bud.


Sent from my iPod touch 4th Gen using Tapatalk
 

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
I'm pulling loom trying to trace this damn black wire. Had to come inside to warm my toes.
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
Pg 152 is mine. I found the ground behind the driver side lamp assembly. Everything seems Ok tho....I'm gonna cut the 3 LED marker bar and see wat happens
 

usar17

Full Access Member
Joined
May 3, 2012
Posts
596
Reaction score
17
Location
PA
First Name
Shawn
Truck Year
1985/87
Truck Model
K20 Silverado
Engine Size
TBI350/700r4/NP208
You must be registered for see images attach
look what I found Haha. Its the harness for the long run to the rest of the truck. I couldn't find any issues with the rear harness that goes to each lamp assembly. So I took they wrap off the main harness and found the wires falling apart. Guess I need to find a new harness to wire in
 

89Suburban

Supporting Member
Supporting Member
Joined
Dec 7, 2010
Posts
24,772
Reaction score
6,637
Location
Southeast PA
First Name
Paw Paw
Truck Year
2007
Truck Model
Chevrolet Tahoe LT
Engine Size
5.3, 4WD
Good job man!


Sent from my iPhone using Tapatalk
 

Forum statistics

Threads
44,173
Posts
950,868
Members
36,288
Latest member
brentjo
Top