Electrical issues.. break lights turn signals etc

10

Asked by Apr 11, 2013 at 02:11 PM about the 2004 Chevrolet Express

Question type: Maintenance & Repair

Headlights all work, but do notice the intensity of the parking lights dim.. had  run with a lot of bulb falures.. then all the sudden the the primary concern.
Hit breaks tail light dim, and back up lights come on. both sides..  when you use the L turn signal it blinks normal unil you hit the breaks, then the reverse light comes on and that blinks.. If the headlights are on, same thing but much dimmer..
I read a lot about socket issues.. so inspected and it looks pretty nomal.. however if I disconnect it.. the break light comming on issue stops on the left side.. so I suspect or can it be as easy as just replace that socket, and wiring harness?  or should I consider some other issues.. Grounding could be it.. it does have a aftermarket trailer wiring harness on that side..  suggestions steps to trouble shoot?  other parts to consider?

8 Answers

Whoa, your last sentence speaks volumes. Thoroughly inspect those wires for frayed, pinched anything that does not look sanitary and secured, then let's go from there

10

it all "looks" ok.. neat and tidy... although the plug outside the van is in bad shape.. I did disconnect the splices into the break light wiring. but no impovement there.. also still think it may be the trailer harness? when I disconnected the LR tail light harness, with the trailer splices.. it fixed the reverse light issue on the R side..so I did remove the 3 wires spliced into that harness.. hoping it was a ground fault in thoes wires somwhere.. then I replaced the l taillight harness - issue returned. without any direct connection to the trailer wiring and the tail light assembly.. nope..

1 of 1 people found this helpful.

Amanda you know what you are doing, I can tell you have knowledge about these things. (BTW I would say the same to anybody it has nothing to do with being a woman)..it's just that so often women write "I'm a helpless female"..what's that got to do with it? Anyway, it's beginning to look like the trailer harness is not the culprit. Let me look at some schematics..be back in a bit. Meantime maybe somebody will see this and offer some other ideas too. But there is a crossed wire somewhere or something along those lines, with the back~up light thing in the mix.

2 of 2 people found this helpful.
100,075

David, I too believe that Amanda has a firm grasp of the situation and does not need the hand holding and step by step guidance that less knowledgeable people require. --- Any time you see lights coming on when they are not supposed to - you have current back feeding. Electricity seeks the path of least resistance. If you lose a ground connection, that path is through another bulbs filament to get to ground. I have seen the turn arrows light up on the dash board and you have seen the reverse lights turn on. --- The other thing to consider is some of the GM products use a circuit board in the tail lights and they are a source of some problems.

3 of 3 people found this helpful.

Thanks for the input TS. Valuable. You're right, I don't think I know any more than she does. Matter of fact less .. Sorry Amanda for talking about you in third person like that. Not real polite. But tenspeed is exactly what I meant by somebody coming along...consider what he said. I am not having much luck..I studied wiring diagrams and he has it pegged.

10

no problems.. thanks.. but not complete grasp.. just willing to look into previous questions.. and gave me some ideas or thoughts.. I have "some" idea..of some basics.. but most a case.. well hell why not try this vs any real formal knowlage.. I been thinking cheap enough part to try the sockets and harness.. only because find it odd.. that one of the issues, the break light reverse light thing.. does resolve when I remove that group of items.. unplug that side.. makes me think it MUST be something on that side.. however.. also do know.. or have at least a minimal understanding yeh I unpluged it.. however there is other things further down the chain so to speak.. so May not prove a simple solution.. :) it bugs me..because frankly the whole thing looks good on visual inspection.. ideal.. no.. but pretty standard for a lot of aftermarket work..

25

when i had a problem with nonfunctional reverse and brake lights, i took a VOM DC clamp on to all the wires in my 3500 express 05. i found that certain lamps needed 7 amps to light, others took only 4. if a wire is not delivering enough amps the bulb will be dim or not light at all. (i found that the Haynes manual for Chevy vans $20 at autoparts stores have great wiring diagrams of lamp assemblies. all wiring for t he right and center lamps runs off the left driver side . so if you have a right side problem, check the amps in to the left...

1 of 1 people found this helpful.
20

Try n double check the fuses. Because the brake n turn signal system uses the ground from the emergency flasher. Try turning on the flasher n hold down the brake paddle. See what happens..

2 of 2 people found this helpful.

Your Answer

Express

Looking for a Used Express in your area?

CarGurus has 4,806 nationwide Express listings starting at $2,500.

ZIP:

Chevrolet Express Experts

  • #1
    tenspeed
    Reputation
    280
  • #2
    Sarai Sanchez
    Reputation
    240
  • #3
    dizybren
    Reputation
    230
View All

Related Models For Sale

Used Chevrolet Express Cargo
67 Great Deals out of 11,348 listings starting at $2,000
Used GMC Savana
3 Great Deals out of 1,227 listings starting at $3,799
Used Ford E-Series Wagon
28 Great Deals out of 1,125 listings starting at $3,299
Used Ford E-Series Cargo
65 Great Deals out of 2,991 listings starting at $1,995
Used Chevrolet Silverado 2500HD
316 Great Deals out of 29,243 listings starting at $2,650
Used GMC Savana Cargo
13 Great Deals out of 3,707 listings starting at $2,500
Used Chevrolet Silverado 1500
2,166 Great Deals out of 181,094 listings starting at $1,900
Used Ford E-350
221 listings
Used Ford Transit Cargo
46 Great Deals out of 17,797 listings starting at $7,999
Used Chevrolet Suburban
292 Great Deals out of 20,899 listings starting at $1,000
Used Mercedes-Benz Sprinter
3 Great Deals out of 1,963 listings starting at $13,995

Used Cars For Sale

2017 Chevrolet Express For Sale
4 Great Deals out of 2,344 listings starting at $22,500
2016 Chevrolet Express For Sale
3 Great Deals out of 726 listings starting at $18,995
2015 Chevrolet Express For Sale
217 listings starting at $9,995
2014 Chevrolet Express For Sale
4 Great Deals out of 253 listings starting at $11,000
2013 Chevrolet Express For Sale
167 listings starting at $11,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.