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post #1 of 31 Old 09-20-2019, 05:02 PM Thread Starter
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GT235 circuit board shorted

I have a 2000 GT-235 tractor and while I was finishing up my lawn smoke came out of the top area. I shut it down to look at it and thats all she wrote.

After that nothing worked, would not start. I did some testing and realized the battery must have shorted and took out the board. The inside of the battery was a solid block of gel so at least I know what happened. I jumped the engine and everything works so now I need to fix my board. At $175 I am going to replace the resistor to see if it will work.

My question is does anyone have a picture of this resistor with the color bands. Mine is toasted. My neighbor has an older 1997 GT235 but the board is slightly different.

Any help is munch appreciated.

thank you.

dominick
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post #2 of 31 Old 09-20-2019, 07:31 PM
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Re: GT235 circuit board shorted

I have an LX255 and a GT225 that use the same board. The LX machine just shorted out the board because the fuel solenoid grounded out due to rodent damage. I should be able to look at this for you but probably not till Sunday. I will be rebuilding the same exact board. Getting the parts from mouser.com or digikey.com shouldn't be too much trouble at all.

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post #3 of 31 Old 09-20-2019, 08:06 PM
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Re: GT235 circuit board shorted

I found this, might help in the meantime:



*Looks* like orange orange black gold... 33 ohms 5%.

Edit: another picture, pretty sure that's right. Right-click 'view image' and zoom.


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Last edited by Kubota Ronin; 09-20-2019 at 08:20 PM.
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post #4 of 31 Old 09-20-2019, 11:20 PM
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Re: GT235 circuit board shorted

I spent a lot of time today looking at that board! The first 15 amp fuse is the one that kept blowing.
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post #5 of 31 Old 09-21-2019, 06:36 AM
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Re: GT235 circuit board shorted

Not to hijack this thread but a question.
What does a smaller tractor need electronics for, maybe voltage regulation is all I can think of. You have solenoid with the electric clutch which would be a switch and a relay, couple of safety interlocks that can use switches and a few relays. So why the electronics, saying that, they work great when they work but when they don't it's $$$ and a pain to troubleshoot..................Mike

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post #6 of 31 Old 09-21-2019, 07:18 AM
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Re: GT235 circuit board shorted

Quote:
Originally Posted by Mike Milburn View Post
What does a smaller tractor need electronics for
People want more and more features is my guess. Iím not an electronics guru or anything, so I donít truly know whatís necessary to have warning lamps, digital hour meter, RIO feature, etc.

I donít like diagnosing electric stuff, but these tractors are 20 years old. $175 for a new board after two decades is really nothing.

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post #7 of 31 Old 09-21-2019, 07:55 AM
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Re: GT235 circuit board shorted

$175 for the OEM and about $138 for an aftermarket with disconnecting keyswitch, the burden cost itself for the parts is literally pennies on the dollar. I bet no more than 14 dollars in parts with shipping on it. There are 3 relays, two caps, a few diodes (not sure if they are zener or switching type) and two fuses for the charging system. The battery light is controlled by a red capsule looking device with embedded electronics, and the oil light operates by a simple NC pressure switch. Everything else frankly operates very simply from an electronics standpoint.



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post #8 of 31 Old 09-21-2019, 07:55 AM Thread Starter
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Re: GT235 circuit board shorted

I think you are correct, I thought it was brown brown black gold but once I looked at the color chart brown is much darker. thank you,

Only issue is wattage, I cant find a diagram to see what the voltage across the resistor is, may just get a 4W resistor.
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post #9 of 31 Old 09-21-2019, 08:07 AM
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Re: GT235 circuit board shorted

If anything put in a larger one, not smaller... you can see on your board the result @5w. I'd also mount it above the board a tad, maybe 1/8~1/4 clearance so that if it blows again you won't damage the board further, and also it'll help keep it cool.

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post #10 of 31 Old 09-21-2019, 08:11 AM Thread Starter
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Re: GT235 circuit board shorted

agree but once i looked at the chart for dimensions, mine is about 3/8" long so it seems that 2w is that length, if i go higher it will be 3/4" long so it will not fit unless i lift it higher and really bend the connector. Looks like 2w maybe the correct one.
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post #11 of 31 Old 09-21-2019, 08:14 AM
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Re: GT235 circuit board shorted

No that's a 5W tolerance resistor... greater wattage tolerance does not necessarily equal greater length.

You can also manipulate the leads a bit to fit a slightly longer component. No harm done.

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post #12 of 31 Old 09-21-2019, 08:16 AM Thread Starter
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Re: GT235 circuit board shorted

good point, at .34 each I gonna get a couple of each just in case. Thank you so much for the help.
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post #13 of 31 Old 09-21-2019, 08:21 AM
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Re: GT235 circuit board shorted

Where are you sourcing your parts? Mouser or DigiKey have a large selection of components with various size (and quality) options.

A side hobby of mine is rebuilding vintage audio equipment... fitting a size 12 foot into a size 9 shoe has become a specialty of mine, but often you can get very close re. fitment.

One option would be to 'stand' the resistor, having the bulk of it vertical rather than horizontal, then just bend the top lead back down to the board. Once again no harm done, the electrons won't know the difference.

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post #14 of 31 Old 09-21-2019, 08:27 AM Thread Starter
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Re: GT235 circuit board shorted

Looking at digikey right now. Need to check out mouser also.
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post #15 of 31 Old 09-21-2019, 08:38 AM
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Re: GT235 circuit board shorted

I'm looking too... maybe less than 5W would do. Hard to get the scale on internet pics.

I couldn't find the schematic for that board. But the rate of failures on these is a clear indicator that the original is slightly undersized. Going larger can't hurt, and may well help protect against future smoke.

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