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volt readings for testing pickup coil?

Discussion in 'The Garage' started by bryguy00b, Feb 2, 2004.

  1. bryguy00b

    bryguy00b 3/4 ton status

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    im going by the service manual, it tells me how to test the pickup coil with the leads, but doesnt (or i cant find) what parameters the reading is supposed to lie in..anyone have an idea? /forums/images/graemlins/dunno.gif /forums/images/graemlins/thinking.gif
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    i think yoiu mean ohms not volts /forums/images/graemlins/shame.gif i just replaced a module two days ago and i think it said that the pickup coil should be under 50 ohms. i could be wrong though
     
  3. bryguy00b

    bryguy00b 3/4 ton status

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    yea..ohms..do u test it by touching the both terminals on the coil with the ohmmeter? thats the way it shows it in the book..i did this and get no reading at all..
     
  4. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    that wouldn't be the pickup coil. to test the pickupcoil you need to pull the cap off and on the right side of the module is a plugin. unplug that and stick the meter in the plug in.
     
  5. bryguy00b

    bryguy00b 3/4 ton status

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    yea, thats what im talking about..
     
  6. Thunder

    Thunder 3/4 ton status

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    I believe the Readings should be between 500-1500 ohms. If you get no readings at all the circut is open and the coil is bad.
    That is a very good reason your truck wont start
     
  7. k5blazerus

    k5blazerus 1/2 ton status

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    Thunder is right. 500 to 1500 ohms for the pick up coil
     
  8. bryguy00b

    bryguy00b 3/4 ton status

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    ok great guys thanx!!! /forums/images/graemlins/peace.gif
     
  9. ZonkRat

    ZonkRat 1/2 ton status

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    Thunder is right.There's a good writeup in the Pit Stop section of Hot Rod{Jan.04}that tells how to check HEI coils,the pick up coil and modules{GM}.
     
  10. bryguy00b

    bryguy00b 3/4 ton status

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    hmm..really..ill have to check the mag. section next time im in the store /forums/images/graemlins/thinking.gif
     
  11. bryguy00b

    bryguy00b 3/4 ton status

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    well, it must be the modual! pickup coil checked out at 749 ohms, cap,roter,and coil are off my dads truck which runs fine, and none of that did it. so that leaves the modual. i had it checked at autozone and they said it was good though. and i have 12 volts going to the coil. im lost, this is still wierd, truck started fine one day and just stopped the next. still not getting spark.
     
  12. blackblazer717

    blackblazer717 1/2 ton status

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    mine did the same thing and i sware in the time ive owned it its done it at least 5 times. i hate it. it will start when you go get coffee, you come out and it wont fire, and engine sounds like no spark, sure enough something in that crappy HEI Dist. has screwed up again

    LUKE
     
  13. hack500

    hack500 1/2 ton status

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    for voltage a good pickup will put out between 1.5 to 2.5 vAC.
     

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