2007 9400i not cranking

Discussion in 'Trucks [ Eighteen Wheelers ]' started by God prefers Diesels, Dec 1, 2020.

  1. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    VIN: 7C532829

    I've replaced the ignition switch already, because I wanted my door locks and ignition switch to match. Already swapped relays in the glove box. Replaced starter solenoid on the firewall.

    What would happen before, is every now and then it would just click really fast when I turn the key. If I shut off my blower motor, it would crank. Like it wasn't getting enough voltage or something. But recently, you turn the key, and nothing. You could hear the relay in the glovebox click, but that's it. So I used a claw hammer to short the lugs on the firewall solenoid, and the engine cranked over perfectly. That led me to believe that solenoid was bad. I verified yesterday the truck would still not crank before I replaced the solenoid. So I went ahead and put a new one on. Cleaned all wires with emery cloth. Also cleaned 150 amp fuse and ground lug. Truck cranked over perfectly with key. Problem solved...

    Got in it this morning, no crank. Had to short the solenoid with a hammer again. WTF am I missing? What else is in between the key and that solenoid?
     
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  3. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    After it warmed up, I killed it and restarted with the key five times in a row. It was 27 degrees this morning. Not sure if that adds to the puzzle or not. But shorting the firewall solenoid causes it to crank no problem at all. No drag, engine cranks quickly and fires right up.
     
  4. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    Is your rig a Volvo automatic or some such? If so,what about checking/ replacing the Neutral Safety Switch? Next, really investigating your negative battery cables for corrosion anywhere.JMO
     
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  5. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    International with a 10-speed, and it doesn't require the clutch pushed in to start it. I've also recently removed all the battery cables and shined everything up.

    It's really stupid and intermittent. Sometimes it fires right up. Sometimes it clicks really fast, and then fires. Sometimes it doesn't do anything, and I have to short the solenoid on the firewall to get it to crank. So it's definitely got the juice to crank, but I think it's got to be something between the key switch and that solenoid on the firewall. But I'm not 100% sure of the circuit. I think it's: key switch>relay behind glove box>firewall solenoid>starter solenoid. Is there anything else that affects that circuit?
     
  6. FLHT

    FLHT Medium Load Member

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    Load test your batteries ?
    Could be a flat spot on your starter ?
     
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  7. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    No. If I short the firewall solenoid, they have no trouble winging the engine over.

    I don't think it could be that. If it were, then it wouldn't crank even when I short the solenoid on the firewall, correct? I'd need to energize the bendix and bar the engine to move off the flat spot before it cranked at all I'd think.
     
  8. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

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    I'm leaning away from flat spots also. I think that o7 originally had a clutch safety switch. Someone may have 'bypassed it' for emergency starting on a railroad track or its simply stuck shut ( most of the time/ random connection. Believe by jumping solenoid you're effectively bypassing it.Im thinking to replace clutch switch ( so its only closed when clutch is depressed). Theory is occasionally clutch switch moves from being totally closed to open circuit ( just enough to require the solenoid jump). You're running out of solutions. Lol
     
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  9. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    I mean it's worth a shot, right? I could just jumper the switch and see next time it doesn't want to start. I know the switch at least can work, because it will kill the Jakes and the cruise.
     
  10. 062

    062 Road Train Member

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    I can’t believe you haven’t paged a experto_O @Heavyd
    Does the solenoid have a ground wire or ground through the case? Only thing I can think of is a bad ground.
     
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  11. God prefers Diesels

    God prefers Diesels Heavy Load Member

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    LOL, honestly it's because I'm always bothering that guy. I figured this time I'd let him get around to it whenever. In the meantime, I've always got a hammer!

    This solenoid has the regular two large lugs, and then two small lugs. I've never tried to key it on while checking with a multimeter, because I've been by myself and I can't reach. Thing is, I've got jumpers I could rig, but it was so dang cold this morning, and I was pissed that I hadn't actually fixed it, that it completely slipped my mind. So I'm not actually sure if the solenoid is even getting signal during the times it won't crank.
     
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