tc30 no start with gloplug wire plugged

joseph39421 · Feb 1, 2006

I have New Holland tc30, it will not start when the gloplug wire is pluged in. When I unplug it it will start up, I even put a new ignition switch on it thinking that was the problem, the glowplug wire comes from the ignition switch. I have noway of getting the tractor to the dealer and the machanic I talked to is a noshow, this tractor has only 307 hrs on it, it also burns the fuse wire at the starter when the glowplug wire is pluged and I try to crank the tractor, when the gloplug wire is unpluged it wont burn the fuse wire. If anyone can help me I would be very greatful.

Thanks
Joseph

Soundguy · Feb 1, 2006

Ok.. lets think this thru. If glowplug control wire is unplugged.. then all is ok ( except no glowplugs ).

If glow plug control wire is plugged in and you hit the starter.. it burns the main fuse i am presuming, as the aux wire from the solenoid that you speak of probably feeds the fuse panel.

That suggests a short. 3 areas could be at fault. 1, the actual wire that runs from the ignition switch to the glow plug timer could be chaffed and shorting to ground. 2, the glowplug timer module could have an internal short, or bad plug, etc. and 3, the glow plug circuit could have a short, either the glow plugs themselves, or the buss wireing connecting them. Now. I'm not familiar with how your tractor feeds power to the glow plugs. If it feeds them off of the main fuse, then any of the 3 could be a possibility. If instead, only the control module is fed, and the acutal glow power is on an outside line.. then that would rule out the plugs and the buss wire... however.. I have a sneaking suspicion that they are fed off the main panel.

Try this for diagnostics. Disconnect the feed wire from all the glow plugs,.. that is.. dissconnec tthe power wire to the paralleled bus... replace fuse and try it. If all is ok.. then you have a shorted glow plug, or the bus is touching something and shorting. Easy way to check is to connect one plug back at a time till you hit the fault again.

Now.. if that didn't help, find the glow plug control module. disconnect the wire from the ignition from it.. but otherwise leave other lines connected. if that helps, then the module, or mounting or associated wires in that area are suspect. If not help, then remove the line from the ignition switch, and leave it hanging at the module and ignition switch, and run a new temp line from glow plug module to ignition switch. if that helps.. then the line in the wire harness was shorting.. if not.. .. hmm.. I'd have to see the circuit to get into it deeper. You already replaced the switch. assuming you did it correctly and didn't short any lugs.. that should be ok.

I'd have a couple boxes of fuses on hand for testing /forums/images/graemlins/blush.gif

post back.

Soundguy

DieselMonk · Feb 2, 2006

I know that the same kind of tread was here not too long of time. What did the problem end up being, Soundguy? Went back to the old tread, but didn't say nothing. I am just curious...

Max

Soundguy · Feb 2, 2006

A short in the wire harness, AFAIK.

Soundguy

joseph39421 · Feb 2, 2006

Thanks for your help, im not very machanicly inclined at all, where was the short at in the wireing harness? I may can find it on mine if I know about where the otherone was, and where is the main fuse at? I wish I knew how to use a volt meter, may could find it myself then.

Soundguy · Feb 2, 2006

The short was in the bundle from the back of the dash.. all tied together.

You probably do need to learn to use a vom.. It is way easier to find shorts that way.. and voltage drops.

Soundguy

joseph39421 · Feb 2, 2006

The machanic called and said he will be here at 7:30 am in the mornin to fix whatever it is, thanks alot for all the info, ill let you guys know what he finds.