Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Wwhat is this? I think i destroyed it.

Discussion in 'The Garage' started by n8brown, Mar 14, 2006.

  1. n8brown

    n8brown Registered Member

    Joined:
    Dec 8, 2005
    Posts:
    23
    Likes Received:
    0
    Location:
    Portland, OR
    So i was putting my new alternator in. When i put the wire that fits on the bolt in the back on it started sparking. then, something on the firewall started sparking and made some noise and then smoked. I THINK it was this but what the heck is "this?" Also, how screwed am i?
     
  2. ryan22re

    ryan22re 1/2 ton status

    Joined:
    Feb 5, 2005
    Posts:
    3,368
    Likes Received:
    0
    Location:
    Irmo, SC
    probably just burned up a fusible link.

    find it and replace it.

    next time disconnect the battery when changing the alternator.
     
  3. colbystephens

    colbystephens 1 ton status GMOTM Winner

    Joined:
    Feb 24, 2005
    Posts:
    10,924
    Likes Received:
    20
    Location:
    Oregon
    the "this" he is referring to is the following picture.
     
    Last edited: Mar 28, 2006
  4. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    this is just the junction block for the power

    still next time disconnect the batt first
     
  5. wildmouse216

    wildmouse216 1/2 ton status

    Joined:
    Dec 26, 2005
    Posts:
    135
    Likes Received:
    0
    Location:
    Rifle, Colorado
    I agree fusible link fried. This is like a circuit breaker in the wire that chevy put in. I don't know what for but they are hard to find if you don't know what to look for. The insulation on the wire will be a little blackended and look melted but will most likely still be on. Happy hunting.
     
  6. n8brown

    n8brown Registered Member

    Joined:
    Dec 8, 2005
    Posts:
    23
    Likes Received:
    0
    Location:
    Portland, OR
    so the thing in the picture has nothing to do with it?
     
  7. ryan22re

    ryan22re 1/2 ton status

    Joined:
    Feb 5, 2005
    Posts:
    3,368
    Likes Received:
    0
    Location:
    Irmo, SC
    thats where the fusible links connect to.
     
  8. chevyin

    chevyin 1/2 ton status

    Joined:
    Sep 14, 2005
    Posts:
    1,324
    Likes Received:
    0
    Location:
    Pismo Bch CA
    They are a resistor for the coil. Chevy use to use a piece of wire a certain gauge and thickness (to gain a certain resistance), now GM uses (well when your truck was new) a 'fuseable link', the thing you smoked. ;) Just go get a new one, im sure your local PepBoys/AutZone will have them.
     
  9. n8brown

    n8brown Registered Member

    Joined:
    Dec 8, 2005
    Posts:
    23
    Likes Received:
    0
    Location:
    Portland, OR
    oh man i hope so. so after all that happened i connected my batteries to try and start my truck so i could move it and nothing happened. No electricity. That problem is becuase of the fusable link?
     
  10. chevyin

    chevyin 1/2 ton status

    Joined:
    Sep 14, 2005
    Posts:
    1,324
    Likes Received:
    0
    Location:
    Pismo Bch CA
    I would think the truck would still turn over without it, just run poorly, but Im not sure. Dont think Ive ever had a bad one. ;)

    edit: on second thought, you probably aren't getting any current to the coil if its actually fried, so ya that would make sense.
     
  11. colbystephens

    colbystephens 1 ton status GMOTM Winner

    Joined:
    Feb 24, 2005
    Posts:
    10,924
    Likes Received:
    20
    Location:
    Oregon
    for what it's worth, he's got a 6.2L
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,178
    Likes Received:
    1,387
    Location:
    E-town baby!
    The fusible link is there to protect the rest of the electrical system in case of a short like you caused. It is basically a short length of wire about 2 or 3 sizes smaller than the rest, designed to allow normal operation but melt first if there is a short. With a blown fusible link you won't have power to much of anything...

    Rene
     
  13. colbystephens

    colbystephens 1 ton status GMOTM Winner

    Joined:
    Feb 24, 2005
    Posts:
    10,924
    Likes Received:
    20
    Location:
    Oregon
    to add to his story, he had the battery disconnected before this happened, but when he reconnected the battery, that's when this occurred. recently, his batteries only last about a week or two before they need a recharge (not the reason he changed his alternator tho - it tested good, just had broken fasteners). I was thinking maybe there's a leak in his electrical system, and that's what initially caused the sparking. could this aid in his search for an electrical leak?
     
  14. afroman006

    afroman006 1/2 ton status

    Joined:
    Aug 21, 2002
    Posts:
    2,876
    Likes Received:
    0
    Location:
    College Station & Kingsville, Texas
    I roasted the fusibile links in my trail truck one time (it has a 6.2 with a gasser wiring harness) and i would not make any indication of life when I tried to crank it. The insulator between the alternator case and the positive output stud on his alternator might be bad, and cause the short. Is the stud loose or wobly?
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    If you fried the link(s) on connecting the battery, that's a fairly good indicator that something is wrong in the electrical system, and probably also likely what the problem is with the battery charging issue.

    If sparks came from the junction block pictured, you might want to double check that the fusible links are actually bad, and that something isn't going on with the other component hooked up to the block. It almost looks like there is another wire hooked up to the junction block going to the other side of the firwall?

    You will also need to test to see what kind of draw there is on the battery when the truck is turned off. But *if* it was enough to burn the fusible links, it would be enough to burn the fuse out in whatever you use to test draw.

    Probably can't hurt to pull the nuts off the junction block and clean up the terminals on the wires, they look a little corroded, plus if you are going to check the fusible links...
     
  16. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    just to expand on dorians good advice...

    if you think you have a draw, turn the key to off, disconnect the ground for the battery, put a testlight between the post and disconnected cable. it should light if you have a draw.. you can isolate the prob by then pulling different fuses till the light goes out..

    also, when electrical connections fail, a prime culprit is often the end connectors.. corrosion and movement tend to make these the weak links... often it is a good idea to cut the wire back a couple inches to fresh meat and solder up a new connector...

    definitely sounds like a fusable link in your case, but thats something to look out for at places like that junction block, starter wires, etc...
     
  17. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    You have been misinformed... :rolleyes: You won't find a resistor for the coil on a GM newer than '73 or so. A fusible link is a piece of special wire that is calibrated to burn in two at a specific current (just like a fuse would, hence the name "fusible" link). It is covered with a flame proof insulation to prevent starting a fire when the fusible link gets toasted.
     
  18. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore

    the infamous resistor wire... :wink1: i remember my bud having fits with his 70 Chevelle after installing an MSD cuz of the wire, need that full 12 obviously... very obviously a different style wire when you look at em with that cloth-like covering they had.. seen them give people fits on a few occasions... :doah: :haha:
     
  19. HarryH3

    HarryH3 1 ton status Author

    Joined:
    May 31, 2000
    Posts:
    10,384
    Likes Received:
    2
    Location:
    Georgetown, TX
    Chrysler used a big, ceramic resistor back then, that would burn out on a regular basis. The engine would start (resistor was bypassed in "crank" mode), then die immediately when you released the key. Everyone I knew that had a Chrysler product kept a spare resistor in the glove box. Great design... :rolleyes:
     
  20. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    haha, yup, i grew up a Mopar guy.... :D

    you can add torsion bars to that list of wonderful engineering too imo.. :haha: once i went Chevy with coils i was like what was Mopar thinking with that one... :doah:

    tho i always liked the shaft mounted rockers... ya could really spin up some rpm's with them....
     

Share This Page