JD 870 will not start...

[grsthegreat]

You and I got into this once before, and I suspect that you never read the link I posted, either now or in the past. As to your Generac example, yes I can offer an explanation, but why bother? After all, you don't care what people say. You're the NEC Code Man. Also, when you experience these mythical occurrences, what kind devices were you feeding?

by all means, lets hear your explanation about the generators. There the only 12 volt systems i have much experience with. Everything else is high voltage. Dont work with autos much.

Im always open to hearing about better ways to fix something. When you stop learning ... that means your dead.

I dont know why you think im closed minded about this theory. Im just stating what i have found in the real world.

 

[Fuddy1952]

Re: JD 870 will not start...UPDATE>>>REPAIRED!!!

As a retired 43 years electronic technician I believe electricity is one of the most difficult things to understand, probably because you can't see it.
All I did was troubleshoot and yes I've seen plenty of weird unexplainable things, but it all boils down to ohms law, like this cartoon demonstrates.
Electricity is easier to understand if you relate it to water. Battery is the storage tank, generator or alternator a pump, wires are pipes.
Voltage is electrical pressure.
Current is volume.
Ohms is resistance.
A small thick wall pipe can carry lots of pressure but not much volume. (Like spark plug wires).
A big pipe, lots of water volume just like why the battery to starter wire is so big.
Resistance like a bad connection is like a restriction in the pipe (or wire), so voltage (pressure) tries pushing current (volume) through.
When voltage (pressure) goes down current (volume) also goes down. Same with resistance. High resistance creates a voltage drop. High voltage like spark 1,000 ohms doesn't mean much since current isn't high. A starter circuit 1 ohm is a lot because 12 volts is trying to push 200 amps or more.
The battery is for starting an engine. Once started the generator or alternator takes over. The battery isn't needed anymore since engine runs the pump.
This is over simplification but maybe it helps understanding.View attachment 677334

 

[Fuddy1952]

Re: JD 870 will not start...UPDATE>>>REPAIRED!!!

.

 

[Industrial Toys]

One day if I have my scanner out, I should post a "Fairchild Semiconductor" Article on designing automotive power supplies and all the mayhem, spikes, collapsing fields and so forth that goes on in the average automotive electrical system.

Makes me wonder if my chance the OP boosted and ran his JD without a battery.

 

[fried1765]

Re: JD 870 will not start...UPDATE>>>REPAIRED!!!

.View attachment 677346

LOVE IT !!!!

 

[JS415]

Makes me wonder if my chance the OP boosted and ran his JD without a battery.

Thanks for all the comments and ideas. I've never had to jump it off, or ran it without a battery. When the battery was too low to start, I would just put a charger on it for an hour or two and fire it right up.

It cranked just fine, although only about 3 times, the morning it quit. Only after the battery was completely dead, did it not start. That has to be when the fuse blew. Too low of a voltage, or too much strain on the battery, and the weakest link let go? It was only a 3A fuse, the lightest fuse in the box.

It was just sitting int he barn, so I was not running or operating the PTO.

I'm just glad it's fixed and ready to go. I've got about 5 acres that need to be mowed pretty soon......

Thanks,

Jerry

 

[grsthegreat]

What happened to K7LN. his post disappeared. I was wanting to hear his ideas as to why my real world experiences were wrong.