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Thread: 1993 intermittent no start

  1. #1
    Join Date
    Feb 2003
    Location
    Grand Rapids MN 55744
    Posts
    1,648

    Default 1993 intermittent no start

    Howdy
    Merry Christmas!
    My son's 1993 6.5 manual just today would not turn over.
    Clutch in, key on- all the dash lights come on.
    Turn the key to start, nothing.
    Jumped the clutch safety switch. Nothing.
    Checked voltage at the switch and found none.
    Hooked up and pull started with NO problem, ran fine.
    Ideas?
    Thanks!
    1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
    1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
    2001 Chinook RV, V10 gas
    1974 John Deere 1530 diesel tractor
    1993 John Deere 455 Diesel lawn mower
    1967 GTO, 1989 Honda Transalp
    2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
    1998 6.5 suburban, stock, daughter's
    1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

    1984 6.2 ATS turbo 3500, SCDWLB - Son's
    3 kids, 1 wife, 1 dog
    Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!

  2. #2
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,612

    Default

    Merry Christmas
    Bad connection is the first thing i would look for starting with the trigger wire for the solenoid,then the main power wire.You can try to trigger the solenoid with jumper from a + source.
    Then the starter,how old is the starter? The brushes could be wore out and one isn't making contact any more.The surfaces on the contacts in the solenoid could be arced and rough not making contact anymore,i have taken them apart and filed the contacts smooth and flipped over the disc inside to get a starter to work again.
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  3. #3
    Join Date
    Jan 2001
    Location
    New Hampshire - Live Free or Die
    Posts
    6,057

    Default

    I recall there are problems with the ignition switch itself that can result in no trigger to the starter motor.
    The Constitution needs to be re-read, not re-written!

    If you can't handle Dr. Seuss, how will you handle real life?

    Current oil burners: MB GLK250 BlueTEC, John Deere X758
    New ride: MB GLS450 - most stately
    Gone but not forgotten: '87 F350 7.3, '93 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6, '90 MB 350SDL, Kubota 7510

  4. #4
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    You may want to check for 12V at the starter solenoid terminal.

    Not too hard.

    Jack up rig and block..Remove RH front tire/wheel
    Remove rubber splash flap in the fender well.

    The starter wiring is all right there within easy grasp.

    If you have 12V at the solenoids small wire when key is turned to start then the starter is KAPUT.
    Can be just the solenoid or the motor.
    Also try whacking the starter with a hammer when the key is turned to start.

    Quicky check


    Also...with the access open in the wheel well you can easily get to the starters front hanger bracket real easy...
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  5. #5
    Join Date
    Feb 2003
    Location
    Grand Rapids MN 55744
    Posts
    1,648

    Default

    Howdy
    OK- So we thought maybe the truck fixed itself, NOPE!
    Had to push start twice yesterday.
    New things that we found/checked:
    - Starter and all connections down below are good
    - Starter signal wire from starter to the back of the block is good
    - Ignition seems to work with everything but making the truck start

    - Currently we spliced into the signal wire from the starter at the back of the firewall and ran a 12v wire to tractor start button inside the cab and it works fine

    Questions-

    Can anybody tell me how the clutch safety switch works in this truck?

    Or is there an ignition relay someplace?

    Is it a direct in line switch or does it go to a relay someplace or go through the "ecm"

    We are having trouble locating a wiring schematic for this particular truck.

    Thanks !!!!!
    1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
    1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
    2001 Chinook RV, V10 gas
    1974 John Deere 1530 diesel tractor
    1993 John Deere 455 Diesel lawn mower
    1967 GTO, 1989 Honda Transalp
    2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
    1998 6.5 suburban, stock, daughter's
    1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

    1984 6.2 ATS turbo 3500, SCDWLB - Son's
    3 kids, 1 wife, 1 dog
    Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!

  6. #6
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    Clutch safety switch interrupts the 12 v to the solenoid.

    Try bypassing the switch and see if the gremlin is vanquished.

    The fact that you can jump the solenoid and things work takes us to the circuit from the ignition switch to the solenoid.

    Ignition switch or the clutch switch are the prime suspects.

    The linear type ignition switch is very possibly worn out.

    Jump the clutch switch and if the fault is still there then the ign. sw is your issue.

    Pretty easy to drop the column down and stick in a new switch.

    They fasten to the top of the column with a couple screws/nuts.

    One thing you can try is to get the thing to where it will not engage the starter and the with the key held to the start position thump the steering wheel some good ones and see if the jarring will get things to go.

    If this trick does it then the ign sw is the issue.

    Good luck
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  7. #7
    Join Date
    Feb 2003
    Location
    Grand Rapids MN 55744
    Posts
    1,648

    Default

    Thanks Robyn!
    Forgot about the linear switch....
    I have replaced this a couple times on other trucks, amazing how quickly we forget!
    When we jumped the Clutch switch, it had no effect and there was no power to the switch....so that would be the Linear Switch.
    Thanks!
    1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
    1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
    2001 Chinook RV, V10 gas
    1974 John Deere 1530 diesel tractor
    1993 John Deere 455 Diesel lawn mower
    1967 GTO, 1989 Honda Transalp
    2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
    1998 6.5 suburban, stock, daughter's
    1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

    1984 6.2 ATS turbo 3500, SCDWLB - Son's
    3 kids, 1 wife, 1 dog
    Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!

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