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My Son was given a JD RX75 and we tried to start it and there is 2 Black wire not connected. One on the Starter Solenoid under where the wire to the starter is connected. the other is coming from under the seat from the relay. can anyone tell me were those to connect to?

If the solenoid is mounted to the frame it should be wired like this, 2 big cables 2 small.

Scrubcadet10 said:

If the solenoid is mounted to the frame it should be wired like this, 2 big cables 2 small.

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were does that black 90 degree wire on the bottom go to that's one of the wire's not connected to anything?

right where it's hooked at on mine, most likely. if it's got a remote mounted solenoid like this one.

Scrubcadet10 said:

right where it's hooked at on mine, most likely. if it's got a remote mounted solenoid like this one.

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does the other end go to ground on the frame or engine?

CaptHwdy said:

does the other end go to ground on the frame or engine?

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on mine the black one goes from the small lower post on the solenoid, and into the wire loom, so from there it looks to go to the keyswitch... however there is also what looks to be a 4 pin relay under the left panel as well, that it *might* go to as well.

Scrubcadet10 said:

on mine the black one goes from the small lower post on the solenoid, and into the wire loom, so from there it looks to go to the keyswitch... however there is also what looks to be a 4 pin relay under the left panel as well, that it *might* go to as well.
View attachment 56901

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hmm i don't know then the other end on mine has a eyelet on it. i have this diagram and couldn't figure it out. i'll post a pic tomorrow maybe that will help

ok here is a pic the black wire on the left goes on the terminal under the starter wire on the solenoid the right one goes under the seat were the battery is and connects to the relay and key switch. i'm not sure were they bolt on to the engine solenoid battery or what

I've looked mine all over and there are no wires like that....
I hate to assume with electronics, but what i would do, is check for voltage on those wires with a meter ,, with the key in the ON and Start position. if they never have any voltage, i think they would be ground wires. of course if the 1 on the left goes to the right (starter side) side of the solenoid, it would only get power during cranking.
what i would do in this situation is get the model and serial number off the back of the mower (on a sticker, if it's still there) and see if you can get a hold of John Deere.

Scrubcadet10 said:

I've looked mine all over and there are no wires like that....
I hate to assume with electronics, but what i would do, is check for voltage on those wires with a meter ,, with the key in the ON and Start position. if they never have any voltage, i think they would be ground wires. of course if the 1 on the left goes to the right (starter side) side of the solenoid, it would only get power during cranking.
what i would do in this situation is get the model and serial number off the back of the mower (on a sticker, if it's still there) and see if you can get a hold of John Deere.

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i took both black wires and hooked then to the engine then i touch the neg to the battery and the engine started to turn over scared the crap out of me. I don't think that's suppose to do that

ok i got back to this and i just did some testing on the wires one is coming from the left side little post of the solenoid looking from back of the mower. the other black wire comes from the seat and the relay not sure were those to wire goes the have eyelets on them tried looking at the wire schematics and it's all Greek to me

Scrubcadet10 said:

I've looked mine all over and there are no wires like that....
I hate to assume with electronics, but what i would do, is check for voltage on those wires with a meter ,, with the key in the ON and Start position. if they never have any voltage, i think they would be ground wires. of course if the 1 on the left goes to the right (starter side) side of the solenoid, it would only get power during cranking.
what i would do in this situation is get the model and serial number off the back of the mower (on a sticker, if it's still there) and see if you can get a hold of John Deere.

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Can you tell me were the black wire coming from the little post on the solenoid connects to?

To make it easier for everyone, let's call the wires A and B.

(A) has insulation on it.

(B) does not have insulation at the crimp.

Where does the other end of A go to?
Where does the other end of B go to?

sgkent said:

To make it easier for everyone, let's call the wires A and B.

(A) has insulation on it.

(B) does not have insulation at the crimp.

Where does the other end of A go to?
Where does the other end of B go to?

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A Goes to to little post on one side of the solenoid
B Goes to the safety seat switch and relay

B. If you look at the seat switch in the diagram, there are two wires from it. Both go thru what looks like a connector. One comes out of the connector and then goes to ground, and the other comes out of the connector and goes to what looks like 87a on the neutral start relay. 87a is jumpered to 30 in the diagram and also goes to the on connector on the PTO switch.

A. In the diagram the solenoid has two red wires, one purple, and one probably is ground unless it is grounded internally in the diagram. You'll need to follow all the wires to the starter to figure why it is hot when the key is not is the start position.

I suggest you confirm that is a diagram for your model and serial, and then print a large a couple large copies of the wiring diagram and keep it around while you are troubleshooting the issue.

@sgkent: ok so both need's to be grounded to the engine then?

that is why you need to print copies of the wiring diagram, after determining it is for your model and serial, and follow ALL the wires in that area to see if anything else has been changed. Most likely yes but I would not make that assumption without following the other wires in those two areas to be sure none are altered.

snapshots

below is the common electrical sign for ground. My suggestion is don't just start hooking things up because you "think" you know where they go. Figure it out first. You are coming behind someone else's tinkering.

sgkent said:

that is why you need to print copies of the wiring diagram, after determining it is for your model and serial, and follow ALL the wires in that area to see if anything else has been changed. Most likely yes but I would not make that assumption without following the other wires in those two areas to be sure none are altered.

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ok i got the Serial Model # M0RX75X480576 but i can find a wire diagram. the one i have say's

RX SN 498,493-
SX SN 481,333-

What am i missing? would like to get this running so i can mow up at my camp instead of using a push mower

CaptHwdy said:

My Son was given a JD RX75 and we tried to start it and there is 2 Black wire not connected. One on the Starter Solenoid under where the wire to the starter is connected. the other is coming from under the seat from the relay. can anyone tell me were those to connect to?

Click to expand...

Assuming the solenoid in the below picture is the same as yours, it's a basic solenoid used for decades in automotive, aviation, farm, marine, and many more. The two smaller wires should be the switch that activates the solenoid, and the large wire circuit is connected by the solenoid to supply power from the battery to the starter. The solenoid should receive negative power from the frame connection and the positive power from an internal connection from the battery side of the solenoid. Good luck with the troubleshooting.

Carl.Cook said:

Assuming the solenoid in the below picture is the same as yours, it's a basic solenoid used for decades in automotive, aviation, farm, marine, and many more. The two smaller wires should be the switch that activates the solenoid, and the large wire circuit is connected by the solenoid to supply power from the battery to the starter. The solenoid should receive negative power from the frame connection and the positive power from an internal connection from the battery side of the solenoid. Good luck with the troubleshooting.

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I do not see a pic. I took off the purple wire off the left side of the Solenoid and turn the battery pack on and nothing. hooked up the purple wire back on and it tries to start so it's in there were something is wrong?

CaptHwdy said:

I do not see a pic. I took off the purple wire off the left side of the Solenoid and turn the battery pack on and nothing. hooked up the purple wire back on and it tries to start so it's in there were something is wrong?

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Someone else posted a pic. Does your solenoid have two small wire posts? If so does crank when purple is connected without key on? Is the black wire same size and connection as purple? If all is "yes" then purple and black may be reversed or key switch is stuck in "start" position, which happens often with the cheap switches.

Carl.Cook said:

Someone else posted a pic. Does your solenoid have two small wire posts? If so does crank when purple is connected without key on? Is the black wire same size and connection as purple? If all is "yes" then purple and black may be reversed or key switch is stuck in "start" position, which happens often with the cheap switches.

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yes there is 2 small wire's purple/black and when the purple one is connected it start's if i take that purple wire off it don't start. i tried putting them on the other terminal and still same thing. but i have noticed that there is a red wire jumped with the purple wire that goes under the seat some were. if i take that red wire off leave the purple on it don't start. i 'm not using the key switch when i try to start the mower. i have a jump pack . i even unplugged the key switch same thing when i turn the jump pack back on

CaptHwdy said:

yes there is 2 small wire's purple/black and when the purple one is connected it start's if i take that purple wire off it don't start. i tried putting them on the other terminal and still same thing. but i have noticed that there is a red wire jumped with the purple wire that goes under the seat some were. if i take that red wire off leave the purple on it don't start. i 'm not using the key switch when i try to start the mower. i have a jump pack . i even unplugged the key switch same thing when i turn the jump pack back on

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It's sounding more like a key switch and I assume the red wire is supplying power to the solenoid. You can bypass the key switch with single pole switch to ground the magneto for off and another switch to engage the solenoid. I did this on a couple of mowers in the past since the key is the same for all mowers why do I need a key? Will it start with the purple off but the red still connected to the solenoid?

Carl.Cook said:

It's sounding more like a key switch and I assume the red wire is supplying power to the solenoid. You can bypass the key switch with single pole switch to ground the magneto for off and another switch to engage the solenoid. I did this on a couple of mowers in the past since the key is the same for all mowers why do I need a key? Will it start with the purple off but the red still connected to the solenoid?

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the red wire is crimped on to the purple wire with a spade connector and then goes under the seat in a wire harness connected to somewhere . even if i don't have the key switch plugged in? i unplugged the harness from the key switch. i don't even have the key switch turned on i'm using the jump pack to start the mower it has a on and off on it

ok so the 2 red wires from the solenoid and the purple wire goes into one side of the fuse then the other side of the fuse goes to 2 connectors on the key switch. i'm not sure i have the right wire diagram for this mower this is getting really confusing

Carl.Cook said:

It's sounding more like a key switch and I assume the red wire is supplying power to the solenoid. You can bypass the key switch with single pole switch to ground the magneto for off and another switch to engage the solenoid. I did this on a couple of mowers in the past since the key is the same for all mowers why do I need a key? Will it start with the purple off but the red still connected to the solenoid?

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ok do you have a wire schematic to do this?

CaptHwdy said:

ok do you have a wire schematic to do this?

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Sorry no schematic, I have only repaired my own or friends equipment over the years. If it is not electronic it should be simple to rewire using a 12v circuit tester. Most equipment I have seen over the years could have been designed to avoid early failure. Equipment that vibrates damages wires and tubing unless protected from friction. Wires and tubing that touch, pass through unprotected metal, or are too tight and subject to early failure. Modern equipment have switches to ensure safe operations, but not so many they can't be checked. Many times the relays and plug connections just need to be unplugged spray with WD40 and reconnected. If the mower runs with a jumper then all major parts are working. Check all relays, connectors, and wires for corrosion. Use a circuit tester to ensure wires are providing power. You said it was a used mower and someone else may have bypassed a relay or bad wire and left the old wire in place. If it runs and operates safely, I would not worry a out factory correct. Good luck