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.

Cracked 12v Coil Twice In a Row

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 73k20, Jan 9, 2002.

  1. 73k20

    73k20 Registered Member

    Joined:
    Jul 6, 2001
    Posts:
    59
    Likes Received:
    0
    Location:
    South Louisiana
    Does anyone know what would cause a coil housing to crack? We put another one in and within a few minutes the same thing happened again.

    Who said size doesn't matter?
     
  2. chevyracing

    chevyracing 1/2 ton status

    Joined:
    Sep 8, 2001
    Posts:
    2,589
    Likes Received:
    0
    Location:
    Colorado
    Is it the kind that is in top of the cap or the external kind? Maybe the bracket is twisted and it is putting too much force on it. If there is too much voltage it could be super heating the oil inside and and the expansion of the heated oil is cracking the case. Do you have a balast resister installed between the batt terminal and the power source, if not you need to do so in MOST cases.

    John

    Like to go sloppin' 'round in da mud in a rapid fashion....=)

    <a target="_blank" href=http://coloradok5.com/gallery/albun31?&page=1>BLAZER PICS</a>
     
  3. 73k20

    73k20 Registered Member

    Joined:
    Jul 6, 2001
    Posts:
    59
    Likes Received:
    0
    Location:
    South Louisiana
    Well, This is on my friends Toyota 4x4. He has the external type, but it's not the regular round canister type, The internal part is round but the external surrounding piece is square. This might be what is called an open coil. I'm not sure of the ballast resister.

    Who said size doesn't matter?
     
  4. Chris_T

    Chris_T 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    718
    Likes Received:
    0
    Location:
    Saskatoon, SK
    I know a square peg in a round hole doesn't work too good .... guess a round peg in a square hole doesn't either. Is it possible something else has shifted under the hood or been installed that might come into contacht with the housing while bouncing around?
     
  5. 73k20

    73k20 Registered Member

    Joined:
    Jul 6, 2001
    Posts:
    59
    Likes Received:
    0
    Location:
    South Louisiana
    This actually happend while sitting in the driveway. He had some wiring problems last week and now we think that the tachometer wire was connected to the coil which means that the higher the motor reved the more current was being sent to the coil which turned out to be too much current/voltage.

    Who said size doesn't matter?
     
  6. pcorssmit

    pcorssmit 1/2 ton status

    Joined:
    Jan 2, 2001
    Posts:
    1,346
    Likes Received:
    0
    Location:
    Denver, CO
    Is it a stock GM coil (ie the newer TBI style)?

    GMs '75 and newer do NOT use a ballast resistor.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     

Share This Page