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Need help with a fan belt & electrical problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Derf00, Aug 30, 2001.

  1. Derf00

    Derf00 1/2 ton status

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    For the second time in 6 mo my '90 Jimmy threw a fan belt which wipes out the a/c electrical connection. It did this again this afternoon, but this time the parking brake light is staying on and the speedometer quite working. The first time it did it, the cause was a slightly loose pulley under the alternator. This time, I am not sure, because the pulley seems to be tight.

    Any thoughts would be appreciated.

    Derf00

    "A WISE MONKEY NEVER MONKEYS WITH ANOTHER MONKEY'S MONKEY."
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    Check the electrical connection on the master cylinder or by the proportioning valve. That one probably got knocked off. When it sensess little or no pressure it turns on brake light. As for throwing the belts, check and make sure the pullies line up. I had that problem on my Firebird. I use to throw belts at anything above 5000 rpm. After throwing a dozen belts I noticed my alternator was not lined up with the crank pully. I spaced it out with a couple of washers and no more problems. As for the speedometer I would check under the truck and make sure the speedo cable is still pluged in, either that or it shook loose on the back of the gauge. I had it shack of the back of the gauge on my Firebird.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. Derf00

    Derf00 1/2 ton status

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    Come on guys, I really need some help. All electrical connections are good, and were working prior to throwing the belt.

    Derf00

    "A WISE MONKEY NEVER MONKEYS WITH ANOTHER MONKEY'S MONKEY."
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    "Brake" light doesn't come on unless the switch in the valve grounds it. Test this by pullling plug from Prop. valve, and grounding to frame. Light should come on. Only two brake light inputs I *believe* are the e-brake swich(which you can unplug easily) and the prop valve.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't see how tossing a fan belt, with mechanical or electrical speedo could in any way affect their operation! Did you just blow a fuse or something? Not sure if '90's had electric speedos yet...(and would be surprised to find them fused at the fuse panel)


    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     

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