1997 Sierra 1500 5.7 - ING-E Fuse blowing

Discussion in 'GMC Truck Forum' started by stonely, May 28, 2010.

  1. stonely

    stonely New Member

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    #1 stonely, May 28, 2010
    Last edited by a moderator: Apr 25, 2011
    Hi

    I am new to this forum and was wondering if anyone out there can help. I have a 1997 Sierra 1500. My problem is a strange one. I continue to blow the fuse in the engine compartment fuse compartment marked ING-E. The owners manual indicates this fuse id for the Aux Fan Relay Coil, A/C Compressor Relay, Hot Fuel Module and Dual Tanks. I do not have dual tanks. This is a 10 amp fuse. Also, the fuse does not blow when the truck is idling. I have replaced the fuse and it appears to work. After I drive the vehicle and check it again it is blown. I have disconnected the A/C clutch and it still blows. I have replaced and removed the A/C replay and it still blows. I have no idea where or what the aux fan is and where to locate the relay or the hot fuel module. I should mention that that truck runs fine with the fuse blown but the A/C does not work.

    Any help would be appreciated.
     
  2. crabtruck

    crabtruck Senior Member

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    Welcome to the forum stonely.

    This is an actual Owners Manual that says hot fuel mod ? Wild.
    I doubt you have one. Many things listed after fuse names are
    just the generic possibles items, regardless if installed.

    Your fuse which is really "IGN-E" as in the "E" circuit from key switch
    is also used for dual tank balance pumps when needed. You don't.
    Helps to know which engine you have, and any other particulars,
    because for example, a 4.3 would not have a aux fan or relay.
    A 7.4 in California would have an AIR secondary relay on that fuse.

    In order to narrow down your choices for problems, a little testing.
    Remove the AC Compressor Clutch Relay and see if fuse blows
    after giving it plenty of opportunity to do so (like a day's use)
    Also confirm that the fuse that is blowing is the one you think
    and not the 10A A/C COMP fuse.

    Let us know what you have and what you find.
     
  3. stonely

    stonely New Member

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    Fuse Blowing

    Thanks Crabtruck

    The engine in the truck is a 5.7l. Let me review the steps I took to diagnose the problem.
    1. I unplugges the A/C compressor and replaced the fuse. It did not blow immediately but did blow after I drove for a few miles.
    2. I then removed the A/C relay. Again it it did not blow immediately but did blow after a few miles of driving.

    As I mentioned I cannot find the aux fan relay so I did not remove the relay to see if that worked.

    I hope this helps. Please let me know what you think or how I should proceed.
     
  4. crabtruck

    crabtruck Senior Member

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    #4 crabtruck, May 29, 2010
    Last edited: May 29, 2010
    I am missing some info here that would help, I don't 100% trust my drawings.

    If I follow what you have done, the IGN-E fuse blows with AC relay removed.
    You do not have dual tanks with that wiring to worry about.
    You do not have a CA 7.4L with AIR relay / wiring.
    Therefor fuse must not be blowing. whoops.
    BTW does the fuse blow immediately with all hooked up ?

    The fuse/relay(96) block I show is not yours right?
    You have one with AC Comp fuse and no relay SPACE for Aux Fan ?
    Description does not match what I have for a 97, got pics ?

    Have you noticed if the fuse will blow in an amount of time
    similar to how long you drive to pop it,
    1) with key off and parked
    2) key on, engine off, AC off
    3) key on, engine off, AC on
    4) engine on, parked, AC off
    5) engine on, parked, AC on
    Basically looking to see if popping are dependant on other things.

    At the moment this has me a little baffled...sorry.
     

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  5. Mycrofte

    Mycrofte Full Member

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    Either way, if it blows with everything disconnected, all that is left is a chaffing wire. Most likely between the fuse and that A/C relay junction.

    Which is why it only blows when driving. It is only contacting ground when moving around.
     
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  6. crabtruck

    crabtruck Senior Member

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    Interesting idea Mycrofte, just not sure it was ever ALL unplugged.

    If it was then I think he needs to flip the relay collection and follow the wires.
    Travel from fuse to relay is about an inch, so odd, or maybe another
    lead for stuff he doesn't have is loose and/or chaffed.
    So much easier when you can get eyes on. :)
     
  7. wyochimneysweep

    wyochimneysweep Senior Member

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    Do these trucks have a electric fan to help when the a/c is on? if so I had a cooling fan that after a few minutes of it running it would blow the fuse. dont know about this truck but maybe look for a electric fan and unplug it.
     
  8. stonely

    stonely New Member

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    fuse blowing

    Crabtruck

    I took you advice and performed the diagnosic you mentioned. As I was replacing the blow fuse before going through the steps I noticed I did not have a fuse for the aux fan in the fise relay box under the hood. I did notice that there was a separate fuse (30 amps) connected to the Aux B terminal on the side of the box. I am assuming this was a replacement for the aux fan fuse that should be inside the fuse box. When I checked the fuse it was corroded and blown. I replaced the fise before I started testing.
    I went through the procedures you outlined with the engine off, a/c off and on, etc. In every case the fuse did not blow. I then took the truck on the road for about 15 minutes and it did not blow. When I used the truck this morning everything was working...at least for a while. After about 10 minutes of driving the fuse blew again.
    I am attaching pictures of the fuse box. In the upper part of the picture you can see the holder for the 30amp fuse I mentioned earlier.
    Any other suggestions? I tried to inspect the wiring in and out of the box and nothing looks damaged although I did not go nside the box.
    Do you know where the aux fan is located? Is it part of the main cooling fan?
    Thanks again for all your help. Any other suggestions?
     

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  9. Mycrofte

    Mycrofte Full Member

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    The IGN-E and Aux Fan fuses are completely separate though.

    I am wondering about the terminal 4 on the diagram that was circled. I would trace the wires to and from that area.
     
  10. crabtruck

    crabtruck Senior Member

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    Can I mention first that I am no genius, and when these other guys comment,
    it's worth a listen ? Lot of experience avilable in the group. :)

    Big thank you for posting the pics, helps keep details straight.
    I re-labeled your pic to clarify the "aux" and stud thing.
    Aux Fan should not have been moved there, no good cause.
    That fuse is 3x too big for fan coil and load.

    I also noticed corrosion on your battery stud at top of pics,
    you might want to clean that up though not this problem.
    That plus the corrosion you report on the fuse, and the fact that
    you could drive long enough to warm without pop, makes me think
    Mycrofte gave you the right steer to look under relay block.

    If you have an aux fan, which is possible, it should be easy to find.
    It would need to be at the radiator, front or back, would look just
    lke any other fan except a little smaller. It would have wires not a belt.
    Some pics of the rad area and folks here could tell you fast.

    Can you follow and tell where the wires from the A stud go ?
    What is connected to that fuse holder to left with red wires ?
    May not be relevant, but I am curious ...
    Also seems like you're about to lose the top nut off the A stud.
    .
    [​IMG]
     

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