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Testing ignition wires?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BurbinOR, Dec 4, 2001.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    Aside from the obvious visual checks, what is the proper way to ensure ignition wires are in good shape? I seem to remember reading somewhere that checking resistance (ohms) from one end to the other is the way - and the reading should be 1000 ohms..............any input?

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    Yes if you have a DMM(digitail multi meter) do the Ohm check. if you find a 'bad' wire the resistance will be alot higher than the others OR the 'bad' wire will have 0 resitance ie:Open load or broken wire.
    When I put together my Summit blue wires I measured each one after crimping and most all were at or below 1Kohms or 1000ohms.
    Hope this helps
    Good luck

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  3. HarryH3

    HarryH3 1 ton status Author

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    Actually, an open circuit has infinite resistance. Zero ohms is no resistance.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
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  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    I'd obviously check the plugs if you think one has a problem. Usually don't see much for resistance problems with them, but lots of cracked insulations. I usualy spray the wires down with water while the truck is running. It will start to miss when you hit any areas cracked or weak. Also the ole dark garage test (looking at the wires w/ the car running in the dark) is another way to see cracks and arcs.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  5. HarryH3

    HarryH3 1 ton status Author

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    That test can be a hoot! I had a '77 K5 that was misfiring on the highway, especially if it was raining out. Raised the hood one night and the wires were glowing purple for nearly their entire length. Looked like St. Elmos Fire. Occasionally I'd see an arc jump to the engine. Mis-fire diagnosed! [​IMG] New plug wires and it ran like a champ again.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  6. DesertDueler

    DesertDueler 1/2 ton status

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    If you worried about the wires I would just replace them. If they are over 5 yrs/50,000 miles it definatly needs them replaced.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     

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