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  1. #1
    Silver Member
    Join Date
    Sep 2007
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    116
    Location
    Orting, WA
    Tractor
    New Holland TC35D

    Default Glow Plugs

    Just curious if anyone has run into this. On my TC35D, when I start it for the first time on any day, the glow plugs do not activate with the key as they should. Every other time from then on during the day, they activate properly. Its just that first time.

    I'll tear into the switch and stuff if I have to, but I'm wondering if that's a common problem with an easy fix. Thanks

    toni

  2. #2
    Silver Member
    Join Date
    Sep 2007
    Posts
    116
    Location
    Orting, WA
    Tractor
    New Holland TC35D

    Default Re: Glow Plugs

    BTW, I did read several of the posts about problems with the timer relay on this and similar models. Those symptoms seem a bit different and I'm just not sure if its the same thing or not.

  3. #3
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
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    20,949
    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Glow Plugs

    In reading this, the only think I can think of is a bad relay. When you start it the first time, the battery has its lowest voltage. After running for a few minutes with the higher voltage from the alternator, you would have a slightly higher voltage. Perhaps this is just enough to get the faultly timer to function normally. That's the only way this makes any sense to me.
    Jim


  4. #4
    Silver Member
    Join Date
    Sep 2007
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    116
    Location
    Orting, WA
    Tractor
    New Holland TC35D

    Default Re: Glow Plugs

    That makes about as much sense as anything I've come up with. Just for giggles, I'm going to check battery voltage before I turn the key and see what's up. Its a relatively new battery so I'm a bit skeptical, but who knows. I'm just glad I'll be able to sort this out on my own (with help from this group) rather then having to haul it in. I just can't imagine what a pain it would be to have to haul stuff to the dealer for all sorts of little stuff. Frankly, its one reason I don't care about buying stuff with warranty. Absent a catastrophic failure, its usually easier to do something yourself then fuss with the dealer. At least that's the way I'm justifying it right now. probably a way different tune if this was something big.

  5. #5
    Veteran Member
    Join Date
    Oct 2005
    Posts
    1,432
    Location
    N. E. Ohio
    Tractor
    tc- 29d

    Default Re: Glow Plugs

    Battery will probably test fine; the relay has the issues. Just as Jinman says.
    dqdave1; tc-29D; woods 7500 bh; 7308 fel, land pride tiller, land pride rake, gill pulverizer, 60"mmm. , bucket forks , MZ16H

  6. #6
    Silver Member
    Join Date
    Sep 2007
    Posts
    116
    Location
    Orting, WA
    Tractor
    New Holland TC35D

    Default Re: Glow Plugs

    yup. Battery fine. Sometime this weekend I'll have to root around and find the relay, figure out what energizes the glow plugs and wire up my own switch. I've got tons of relays laying around and I'll be dipped if I'll pay 50 bucks for one.

    (yeah sure....what will REALLY happen is I'll fuss with it for a few hours and THEN buy the factory relay)

  7. #7
    Epic Contributor jinman's Avatar
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    Feb 2001
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    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Glow Plugs

    Quote Originally Posted by ctjstr
    yup. Battery fine. Sometime this weekend I'll have to root around and find the relay, figure out what energizes the glow plugs and wire up my own switch. I've got tons of relays laying around and I'll be dipped if I'll pay 50 bucks for one.

    (yeah sure....what will REALLY happen is I'll fuss with it for a few hours and THEN buy the factory relay)
    They don't make this circuit easy to figure out. There are three relays: glow plug timer, glow plug power, glow plug light. The timer relay controls the glow plug power relay by opening the ground path to it's coil. The glow plug power relay has two contacts. One set powers the glow plugs and the other supplies power to the glow plug lamp relay's coil. It is possible for the glow plugs to be working fine and the lamp not indicate. However, if the timer is not working, neither the glow plugs nor the lamp will operate.

    According to my circuit diagram, the timer is relay K4, the glow plug power relay is K3, and the lamp relay is K9. If you are looking at your relays from the left side of of your tractor. The timer is the relay on the lower left with the "tongue" that has a philips head screw holding it in place. It has three wires in a plug right below it. I believe the connector number is C-16.

    Hope this helps you "root around" a bit.
    Jim


  8. #8
    Silver Member TomOfTarsus's Avatar
    Join Date
    Jan 2008
    Posts
    217
    Location
    North of Pittsburgh near Airport
    Tractor
    1999 New Holland TC18 HST

    Default Re: Glow Plugs

    <ahem> excuse the interruption...

    Your circuit diagram?

    That's one thing i was interesed in - shop manuals, wiring diagrams, etc. I just got my TC-18 and ll i have are the owner's manuals. Would a dealer have them, or do I have to get them from NH directly?

    Thanks, & good luck with the relay!
    Newbie 2/9/08! With his vewy foist twactor!
    1999 New Holland TC18, NH 7106 FEL, NH 914A 60" Mower Deck, Box Scraper, 60" Woods Back Blade, homemade lawn roller, 3PH Loader frame, and one (dear) disgusted wife (DDW)!

  9. #9
    Platinum Member kozak's Avatar
    Join Date
    Feb 2004
    Posts
    613
    Location
    Forest, Ontario Canada
    Tractor
    New Holland TC35D c/w FEL, ACCO Allis 1614

    Default Re: Glow Plugs

    ctjstr,

    Check out attachments on Pineridge's reponse to OP's thread. Shows location & how to test timer relay.


    http://www.tractorbynet.com/forums/n...ght=glow+plugs


    Vic
    NH TC35D SS, c/w FEL, Woods Rotary Cutter, Luck Now Snowblower & Universal Forks.
    AGCO Allis 1614 with MMM.

  10. #10
    Epic Contributor jinman's Avatar
    Join Date
    Feb 2001
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    Location
    Texas - Wise County - Sunset
    Tractor
    NHTC45D, NH LB75B, Ford Jubilee

    Default Re: Glow Plugs

    Quote Originally Posted by TomOfTarsus
    <ahem> excuse the interruption...

    Your circuit diagram?
    ToT, the circuit diagram I was using is in the back of the Owner's Manual that comes with the tractor. Did you not get that with your TC18? I have circuit diagrams in the Repair Manuals I own, but the one in the Owner's Manual is fine for most troubleshooting. The location of the relays came from the Repair Manual.

    Your dealer should be able to get the manuals for you, or you can buy them online from NH. They have printed manuals and manuals on CD. They are quite expensive. The CD is about $84 and the printed manual set is about $312. Messicks.com shows the Owner's Manual as selling for over $45.

    Here is a link to the NH website:

    NH Tech Pubs
    Jim


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