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89 Blazer Silverado - Electrical Problem

Discussion in 'The Garage' started by CircuitMan, Aug 15, 2005.

  1. CircuitMan

    CircuitMan Newbie

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    Hi, I'm Kyle, I'm an installer for Circuit City, and I joined this forum to ask about an 89 Blazer I want to buy. He is flexible on the price because the truck has developed an electrical problem - it starts, but any bump causes it to die - and the ecm fuse blows. Is the ecm shot? Has anyone heard of this problem? And were would I start to look for the problem? How complicated is the ecm on this vehicle?
     
  2. clarkjw24

    clarkjw24 1/2 ton status GMOTM Winner

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  3. CircuitMan

    CircuitMan Newbie

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    wow, I read those topics, and it sounds like a ton of work to troubleshoot this problem. I have a couple questions - Ehat does and ECM cost? and How much time and money should I expect to spend on this sort of a problem?
     
  4. opfor2

    opfor2 1/2 ton status

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    I had a problem similarly to this on my 90 K-5. It turned out that one of the wires that the ECM uses had shorted out. Once I found it it was an easy fix. I know that this wont help you find your problem but it’s a short somewhere in your wiring harness.

    Dan..
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Don't waste money on the ECM, 99% of the time they aren't the problem. Agree with the others, likely a wire issue before it gets to the ECM.
     
  6. 6.2LTrailblazer84

    6.2LTrailblazer84 1/2 ton status

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    Circuitman, you wouldn't happen to install car alarms would you?
     
  7. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Gonna have to trace a wire, cause you have a short...
    My S10 Blazer did that. Found that the PO had put spade connectors on the oil pressure switch instead of a new plug, and after a long trip, the exhaust heat melted them together and would blow the ECM fuse.
     
  8. CircuitMan

    CircuitMan Newbie

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    yes, 6.2LTrailblazer84, I do ;-) So then, how much time should I plan on to fix this, if it takes a long time? I'm feeling like I'd better get this truck cheap - there are a lot of blazers out there.
     

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