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Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by clintsk5, Mar 8, 2000.

  1. clintsk5

    clintsk5 1/2 ton status

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    Thanks to all who put there cents in to my inquire!!!! Never thought I would get that much input!! Can anyone help???...OK...the gas gauge?....does it suppose to get 90 ohms full or empty?..The reason I ask...is that i heard it was 90 full...but when I put the wire ( straight off the sending unit ) to ground it reads " empty "...any other time it reads " full ".. Thanx again...
     
  2. BlueKnight

    BlueKnight 1/2 ton status

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    wow I could use information on this to. My gas gauge one day decided to peg ast the full mark and thats it. It will drop to E when im aaaccckkkk cough wheeeeeeeze on the side of the road and walking for gas.
     
  3. clintsk5

    clintsk5 1/2 ton status

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    this one will not move up or down...ig I pull the dash on push it down it will go right back up...but wiil not drop even when I turn off the ignition!!!
     
  4. 6.2 man

    6.2 man 1/2 ton status Premium Member

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    I hope this helps . With GM gauges they use some kind of resister for their gauges . Putting it directly to ground sometimes this isn't a true test . I think if you use a volt gauge on the hot wire you should see a fluctution in volts .Also a good ground is important for these to work . If there is no good ground tank will read full and stay there.
     
  5. Corey-88K5

    Corey-88K5 1/2 ton status

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    If I recall correctly, when the ground is disconnected, the tank will read full. No power just the opposite.

    COrey
    88K5

    [​IMG]<font color=blue>Girls Like Guys In Bow Ties</font color=blue>
    <font color=red>http://www.geocities.com/corey_perez
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    I know that for the '69 - '72 Blazers, 10 ohms is empty, 90 ohms is full. Therefore, an open circuit on the sender wire, or a bad ground to the guage or sending unit will make the gauge go past full. A sender wire shorted to ground will make the gauge read empty. A bad sender could fail either way. I think the circuit is the same on the later model trucks / Blazers.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  7. clintsk5

    clintsk5 1/2 ton status

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    Thanx...I'll keep trying!
     
  8. cityfarmer2

    cityfarmer2 Guest

    I just replaced all gages with auto meter phatoms soon as I can I'll send out a couple of pics. Have not had any problems other than a loose speedo cable. My bag...Gary
     

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