GX345 Burned Part on Ignition Module

[fromjusttheking]

I must have misread your original post on what blow-up on the circuit board. The capacitor on mine was my problem as one I posted photo of. So, I went back out to the tractor garage and with my 82 year old eyes...which I think is pretty good, couldn't find any number(s) on the resister you pointed out in your photo. It does have the Orange bands, but, it's so small I don't think there's any number markings on it. You probably should wait until the tractor will not start and remove the Ignition Module and take it to a firm that sells resistors...like Radio Shack who may tell you want you need.

A part number is not important. The color bands are what is important. Below I provided an explanation for those that might not be familiar with this kind of part and understanding how to find out what value it might be. I know that you already know what is below, so it's info for others not familiar.

Thanks for your help Lad, it is appreciated.

For most carbon film resistors which is this type, each color represents a number from 0 to 9. There are usually 4 color bands read from the left to the right. The first two color bands represent the significant digits of the value. The third color band represents the multiplier such as xx times 1, 10, 100, 1000, etc. There may in certain cases be a 4th color band, but not usually for this kind of resistor, a carbon film resistor. The 4th color band usually represents the tolerance of the resistor value itself such as gold for 5%, silver for 10%, or no band at all for 20%. There are tighter tolerances, but for this part it doesn't apply based on the type of resistor it is. I do believe that the 3rd color band is black, which represents a multiplier of times 1. So orange, orange, black would equal 33 times 1 which is 33 ohms. The physical size of the body of the resistor looks like either a half watt or one watt resistor. This is a pretty common type of part, and should easily be available. I probably have some in my resistor box. Most all electronics oriented folk have a junk box of all kinds of electronic parts, and I am no exception.

I hope that this info will be of value to someone. There is a lot of info available online as well.

 

[dpb800]

A part number is not important. The color bands are what is important. Below I provided an explanation for those that might not be familiar with this kind of part and understanding how to find out what value it might be. I know that you already know what is below, so it's info for others not familiar.

Thanks for your help Lad, it is appreciated.

For most carbon film resistors which is this type, each color represents a number from 0 to 9. There are usually 4 color bands read from the left to the right. The first two color bands represent the significant digits of the value. The third color band represents the multiplier such as xx times 1, 10, 100, 1000, etc. There may in certain cases be a 4th color band, but not usually for this kind of resistor, a carbon film resistor. The 4th color band usually represents the tolerance of the resistor value itself such as gold for 5%, silver for 10%, or no band at all for 20%. There are tighter tolerances, but for this part it doesn't apply based on the type of resistor it is. I do believe that the 3rd color band is black, which represents a multiplier of times 1. So orange, orange, black would equal 33 times 1 which is 33 ohms. The physical size of the body of the resistor looks like either a half watt or one watt resistor. This is a pretty common type of part, and should easily be available. I probably have some in my resistor box. Most all electronics oriented folk have a junk box of all kinds of electronic parts, and I am no exception.

I hope that this info will be of value to someone. There is a lot of info available online as well.

I can check my tractor and take a pic when I get home in about an hour. I've got the same tractor and know just which circuit you are talking about.

 

[dpb800]

It's an orange, orange, black, gold.

 

[Missouri Lad]

Alan, I must admit that I have lost a few brain cells in my long years. Middle of the night I woke up and one of those brain cells came back to life. I realized I have a John Deere Shop Manual like the one the JD Dealer shop uses. It's about 700 pages on everything pertaining to the diagnosis/repairs on the JD 345 Lawn Tractor. There is some 45 pages alone just on the Power Circuit Schematic. This is reference to the following; S1 Key Switch..A3 Interlock Circuit Board -Solder Joint "A"(Ignition Module)..A3 Interlock Circuit Board-F@ and F3 Fuse terminals..A# Interlock-Terminals"X7-2" and "X7-6"..S6 Headlight Switch-Yel/Blk wire/terminal..N1 Voltage Regulator/Rectifier-Yel/Blk wire..S4 PTO/RIP Switch-Yel and Yel/Blk wire/terminal. H3 Engine Oil Light-Yel/and Yel/Blk wire..B4 Oil Pressure Switch-Brn wire.. H2 Coolant Temp Light-Yel and Yel/Blk wire..B3 Temperature Switch-Yel wire..P1 Hour Meter-Blk wire..A3 Interlock Circuit Board-Terminals "X6-C".. S2 Seat Switch-Yel wire.

I'll go through the Schematics and try to locate the "Resistor" you need. It appears for now the schematics don't show any such item.

 

[fromjusttheking]

Lad, don't worry about it. I have found the value thanks to "dpb800" who posted above yours. He took a photo of his module and the resistor is shown clearly enough. I do appreciate your efforts though. You might have found it, but with 45 pages to look through, it might take a good while, and still be easily missed. It would be interesting to see just where in the circuit it is connected. The value is 33 ohms, 5% 1 watt. That (or something close in value) is what has to be replaced. I have a 36 ohm 2 watt that should fill the bill though. I'm pretty sure that it will be close enough to get the job done. It's within 10% tolerance even though the burned one is a 5% resistor.

I should have also clarified something in my description of my last posting. I referred to a "carbon film" resistor, which is not really wrong, but this particular resistor is really what has always been known as a "carbon composition" resistor. Kind of like a resistor that is filled with compressed graphite, which is essentially like the lead in a pencil, but with a certain amount that will measure to a specific amount of ohms. Just a clarification for others that the description was intended for. The outside casing burned, and started to burn the graphite, but not enough to make it fail in the circuit. I was just plain lucky I guess.

Thanks again Lad for your help.

 

[fromjusttheking]

dpb800, thank you for taking the time to take the photo of your module. That was exactly what I needed. I have 36 ohm 2 watt resistor that should work just as well as the original, and with double the wattage, be more or less better than the original part. Will replace it when snow season is finally over and it gets warmer.

It's things like this that make these forums so great. Glad I joined. Will always be happy to share any knowledge that I might have as well.

Thanks again, Alan

 

[dpb800]

No problem, glad I could help.

 

[Durockman]

I had the exact same problem, burnt resistor due to battery being very low. What I found out is this resistor has something to do with turning off the blades when you go in reverse.
No big loss as I see it that was just a pain on the butt feature to me anyhow and not worth the $99.00 (more or less) to fix it. My tractor is running just fine without the resistor.
All other safety features work just fine.