2003 TC30 Won't Start

[Harry in Ky]

The starter has a ground wire? Can you elaborate a little on that?

 

[ranger13256]

Ignition Switch with Keys, Tractor Ignition Switch 86405634 Replacement for New Holland Boomer 3045 2035 3040 20303050 T & TC Series Tractors T2210 T2220 TC29DA TC31DA TC33DA TC34DA TC40A​

22.99 on Amazon if you ever need one.

 

[Dennis59]

Good day folks,

Blue wouldn't start for me today. I call her Blue on account of her color...lol!

Hope you don't mind me running this by you before I go down the part buying trail. I suspect it is the ignition switch but at $300 per unit want some more assurances before ordering. Am I missing anything in your opinion?

Thanks in advance for your help and interest!

This is what I've done.

1) Tested continuity between starter engage pin on switch with starter connector - Good.
2) Engaged glow plug. Illustrated good on dash.
3) Positioned key in run position. Illustrated good on dash.
4) tested voltage in run position, good. On glow plug position, good. When I move the key to start position, I LOSE VOLTAGE.
5) the seat safety switch is disconnected and shorted out to make a closed circuit. Been this way for years.

Also it appears this switch part number is dependent on the PIN of the tractor. I have looked on the tractor and online for the PIN but can't find it. If anyone knows of this please pass it along.

Thanks again and cheers, Greg.

I had the same problem with my 2000 tc29d. It turned out to be that the ignition switch was loose and instead of going all the way to the start position it stopped short.

 

[GregMiddleton]

Looks like I spoke too soon. Blue is down again despite it starting 10's since I cleaned and tightened the + battery wire to the solenoid.

It would appear that I am not getting 12v to engage the solenoid. The solenoid works as it closed when I applied 12v to the tab.

I traced the wire back to a relay that is close to the fuse panel. Checked it for continuity and it passed.

I am getting to the end of my limited skills here. Any thoughts? Are those relays prone to failure? It's cheap and wouldn't mind swapping it out for ***** and grins. Could it be a safety switch? I disabled the seat switch years ago and it appears sound.

By the way for anyone doing this repair the hidden bolt on the starter is a nut and bolt unlike the visible fastener. You have to take the front and side panel off to get a wrench off of it. I am embarrassed to say how long I spent trying to remove it thinking it was stripped, meanwhile it was simply spinning.

Thanks in advance for any additional feedback.... cheers

 

[GregMiddleton]

Ignition Switch with Keys, Tractor Ignition Switch 86405634 Replacement for New Holland Boomer 3045 2035 3040 20303050 T & TC Series Tractors T2210 T2220 TC29DA TC31DA TC33DA TC34DA TC40A​

22.99 on Amazon if you ever need one.

Thanks for this .... a lot cheaper than OEM.... I almost dropped when quoted. cheers

 

[GregMiddleton]

The starter has a ground wire? Can you elaborate a little on that?

Meant to say battery wire.... I was burnt out.... good catch.... cheers.

 

[GregMiddleton]

Maybe I missed it in your description- does the motor turn over when you try to start it or nothing happens?

Sorry missed this.... no nothing happens. As it turns out not getting 12v to the solenoid activate terminal. traced the wire to a relay and checked good for continuity. Cheers,

 

[toot77]

If you are still trying to trouble shoot this, I believe that the way the starting circuit operates is as follows:
(Assuming that all wires and cables are intact)
-- +12vdc to the starter relay coil runs from a +12vdc source (fuse panel) to the starter switch, from the starter switch to and through the contacts on a relay (called the safety relay) then to the starter relay coil.
---- the safety relay is almost a standard 12 volt automotive Bosch style relay, it has the same functions, but the terminals are arranged differently. If needed, you can replace the pricey New Holland part with a cheap Bosch style, but you need to repin the connector. I talked about this earlier in another post. Search to find that if your safety relay is bad.
-- there are a series of safety switches on the tractor (i.e. pto, gear, clutch, seat, etc) that all need to be in the proper position for starting. Ultimately, if all the safety switches line up correctly, it will energize the safety relay mentioned above.
---- depending when New Holland made the change, I believe your TC30 may or may not have a little electronic box that is called a 'safety computer' depending upon its age.
----------- If your tractor does not have the safety computer, the safety switches (mentioned above) are all wired in series with the final output connected to the safety relay's (mentioned above) coil.
---------- If your tractor does have a safety computer, I believe the safety switches (mentioned above) are all wired to the safety computer and the safety computer has an output to the safety relay's (mentioned above) coil.

Bottom line, if your starter relay is not getting +12 volts to its coil terminal, and the fuse supplying the +12 volts to the ignition switch is good, check that the ignition switch is passing the +12 volts to the safety relay, and that the safety relay is passing the +12 volts to the starter relay coil. If the safety relay is not getting energized, check each of the safety switches and then the safety computer.

All testing should be done by measuring voltage at the terminal or connection. Just checking continuity with a low impedance digital meter may show continuity when the contacts will lose the continuity when a load is applied,

I also believe I have posted with wiring diagrams for both a 1520 and a T1520 in the past. Your TC30 is right between them so its wiring should be close to one of them depending on whether it does have or does not have a safety computer. Searching my posts should lead you there if interested.

 

[GregMiddleton]

Thank you for this very detailed reply. Sorry for the tardy response but was off grid for the last 5 days.

As it turns out it was a relay........ Part Number SBA385870641

And to my dismay the bloody thing is $360 CDN!

Looked for aftermarket but haven't found one yet. Keep you posted.... cheers!

 

[toot77]

SBA385870641 appears to be a timer relay in the seat switch circuit. I am not familiar with that seat circuit as my 1520 does not have it, and my T1520 has the seat circuit (which I have bypassed) built into the safety controller. If your TC30 has the SBA385870641, I assume it does not have a safety controller, and the seat switch circuit consists of the SBA385870641 timer and a relay which shuts of the fuel solenoid. I have 2 thoughts about the timer and its high cost, First, you said you have the seat switch jumpered and in that case, rather than spending $$ on the timer, I would figure out how to get along without it (and maybe the shut off relay). Second, the timer looks to be similar to the glow plug lamp timer, and those NGK oe timers are available for around $20 on amazon. If you want to replace the timer, you might (at your own risk) first try borrowing your glow plug lamp timer and try it in place of the seat timer to see if one of the $20 amazon timers might work. I found no information from the seat timer other than it is an NGK timer of some sort and it looks visually similar to the glow plug lamp timer. All the above is a guess from what I see on a TC30 wiring diagram I found online. The diagram lacks enough detail to tell for certain how the seat circuit works. A service manual is needed to get more information to learn much more.