1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Gauge cluster,tail lights and gas gauge problems

Discussion in 'Electrical & Audio' started by Dman1049, Jan 7, 2021.

  1. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    Didn't find any shorts. That orange wire goes to multiple fuses. Now all running lights come on when battery of truck is connected... Even without the headlight switch being plugged in
     
  2. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Age:
    22
    Posts:
    3,708
    Likes Received:
    2,124
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1978, 1980
    Truck Model:
    K10, K25
    Engine Size:
    400(?), 350
    Sure sounds like someone touched the wiring. A lot. Someone call CPS

    Can you send a picture of your fusebox? Are all the glass fuses in the right spots and the right amperages? I have 78 owners manual i could show you the fuse box diagram and a 78 I can show what it generally looks like.

    This is by no means a perfect example, but its what the under dash looks like of my 78. It probably was mostly OK, has some taps as you can see but that was for trailer wiring. Everything present and OK?
    Snapchat-409721278.jpg
     
  3. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    Found the front turn signal on passenger side full of water... Emptied and the problem was fixed with the tail lights. Found a grounded out spot in the pink fuel gauge wire. Gas gauge still doesn't work. Is there a way to test the gauge itself?
     
  4. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Age:
    22
    Posts:
    3,708
    Likes Received:
    2,124
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1978, 1980
    Truck Model:
    K10, K25
    Engine Size:
    400(?), 350
    does your gauge read full or empty? Mine reads past full but I have a switch and a power issue. Its grouned(the sender) fine. I believe an open circuit makes it read full. I could be wrong.

    Do you have a dual gas tank setup or a single tank? If you have dual tanks, wiring to your switch should be accounted for. I have a switch that my wiring is broken to.
     
  5. Grit dog

    Grit dog Full Access Member

    Posts:
    1,336
    Likes Received:
    1,552
    Joined:
    May 18, 2020
    Location:
    Washington
    First Name:
    Todd
    Truck Year:
    1986
    Truck Model:
    K20
    Engine Size:
    454
    Edit
     
    Last edited: Jan 24, 2021
  6. idahovette

    idahovette Full Access Member

    Age:
    72
    Posts:
    2,808
    Likes Received:
    3,915
    Joined:
    Aug 7, 2016
    Location:
    Weiser Idaho
    First Name:
    Perry
    Truck Year:
    1975-1979
    Truck Model:
    K20-K10
    Engine Size:
    350
    Wasn't worth it??
     
  7. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    Was dual now has a single Suburban tank in the rear. Took the gauge out of the cluster. No matter where the needle was the resistance didn't change. It's fun to chase multiple issues
     
  8. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Age:
    22
    Posts:
    3,708
    Likes Received:
    2,124
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1978, 1980
    Truck Model:
    K10, K25
    Engine Size:
    400(?), 350
    is your switch on the "right" tank. As in, i you used the wiring from the driver side tank did you have the switch point to driver side.
     
  9. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    Had wiring from both sides all joined so no matter where the switch is it will read a level. Have a new gauge on the way. Spendy
     
    AuroraGirl likes this.
  10. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    So update... I pulled the fuse block and in cab harness completely out and dug through it. No shorts, gray dash feed wire was tied into all lights in the dash. Also all grounds were tied into one small 16 gauge wire. Made it where the dash feed wire only go to the gauges. Also made multiple grounds instead of just one.
     
    Powerhouse Ranch and AuroraGirl like this.
  11. Powerhouse Ranch

    Powerhouse Ranch 3G Connoisseur Supporting Member

    Posts:
    466
    Likes Received:
    536
    Joined:
    Jan 6, 2021
    Location:
    PA
    First Name:
    Luke
    Truck Year:
    1980 & 1988
    Truck Model:
    C25 & K5
    Engine Size:
    454 & 350
    and?
     
  12. Dman1049

    Dman1049 Member

    Posts:
    34
    Likes Received:
    23
    Joined:
    Jan 7, 2021
    Location:
    Washington
    First Name:
    Dahlton
    Truck Year:
    1977
    Truck Model:
    K20
    Engine Size:
    400
    Left it for the night. Didnt want to be disappointed. This was my last ditch effort. Already pricing out universal wiring harness because $600 to $700 is far too much. How many circuits does the truck really need is what im down to.
     
  13. RecklessWOT

    RecklessWOT Full Access Member

    Age:
    32
    Posts:
    847
    Likes Received:
    1,260
    Joined:
    Feb 20, 2015
    Location:
    New Hampshire
    First Name:
    Kevin
    Truck Year:
    1987
    Truck Model:
    V10 Suburban Silverado
    Engine Size:
    350 TBI
    Instead of buying a whole new harness and going through the hassle of rewiring the entire truck you may actually want to consider bringing it to a shop. Gasp! I know I absolutely hate bringing vehicles to shops and generally refuse to (literally can count on one hand the times I've done over the years it after owning 30+ vehicles), but for something like wiring that I just absolutely cannot figure out I have actually brought two different trucks to two different shops over the years and both times it was less than $100. As much as a pain in the ass as wiring is for the average guy to deal with, for people who really know what they're doing it's no big deal.

    Most likely just something stupid and they can usually find it pretty quick so it ends up being really cheap. Worst case scenario if something is completely fucked and would be complicated/expensive to fix, at least they can pinpoint it so you can go fix it yourself and you only owe a few bucks for diagnosis.
     
  14. Powerhouse Ranch

    Powerhouse Ranch 3G Connoisseur Supporting Member

    Posts:
    466
    Likes Received:
    536
    Joined:
    Jan 6, 2021
    Location:
    PA
    First Name:
    Luke
    Truck Year:
    1980 & 1988
    Truck Model:
    C25 & K5
    Engine Size:
    454 & 350
    that's not a bad idea. just make sure you do your research and don't take it to just some half ass shop
     
  15. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Age:
    22
    Posts:
    3,708
    Likes Received:
    2,124
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1978, 1980
    Truck Model:
    K10, K25
    Engine Size:
    400(?), 350
    Ive always justfied my shop trips by considering how much money I have saved myself by NOT going to the shop, for example, the oil pan gasket on my old car. It would be 800+ for a shop just because of labor, but I did it for my swearing and getting covered in oil and a few hours and a 32 dollar gasket.

    So, when my current car burst brake lines and it was an average of -20 out, I said Id eat 400 dollars for a shop to do all the brake lines because Ive earned that much.

    The only other services Ive had done are tires(just a lot of work without a machine) and alignments.
    I think you yourself can justify bringing it to a good shop, youve earned it.
     
    RecklessWOT likes this.

Share This Page