Help Interpreting Wiring Diagram & Using Multimeter

[dieselcrawler]

The white wire with the blue stakon looks like it's (1) not factory, and (2) hooked up to the battery cable terminal.

That is likely not the white I was referring to, but will check mine asap, and let you know.

 

[dieselcrawler]

I got a close look at my tractor tonight... and a picture. I've marked the white wire from your picture in yellow, it is the feed to the tractor electrical system. Mine is moulded into the battery cable, yours has the blue stakon (crimp-on wire connector, ring type in this case). I want to point out the connector at the bottom of the starter, circled in red. This is the starter trigger wire, disconnecting it will disable the starter. Mine has a male/female blade type with plastic cover connection in the wire a few inches back, follow the blue line in my picture.


I'm having issues uploading the picture. I will edit/add it to this post asap.

 

[truckdiagnostics]

Diesel Crawler is he checking the voltages under load? by back probing at the connector? I've seen nasty voltage drops a crossed timer delay modules that only show up under load. Same for other wires. Your following things closer, it maybe in the steps. Don't want to side track things i read them pretty quick.

 

[dieselcrawler]

TD: Haven't gotten to the point of checking under load yet.

 

[Egon]

Knowing which contact does what you should also be able to determine continuity of the solenoid circuits by taking ohm readings.

Checked my extra solinoid this way and got ohm readings.

 

[sriddle1]

Dieselcrawler, truckdiagnostics, Egon, Zebrafive (so far so good)

Thanks for your input. Looking at the Wiring Diagram - I'm at a juncture in the testing approach to validate if the Y2 Fuel Solenoid, the A1 Time Delay Control Module or perhaps even the K2 Fuel Relay are BAD. In Dieselcrawler's approach, he suggested pulling the Solenoid (which I did) while it remains connected to the X5 Wiring Harness Connector and visually inspect the solenoids plunger retract under load (Key in Start Position). My request (because I am untrained in this space), Is there a way to disengage the starter so it doesn't crank + without affecting necessary power going to the K1 Start Relay, K2 Fuel Relay, the Y2 Fuel Shutoff Solenoid and the A1 Time Delay Control Module so Zebrafive's RED & WHITE Wire Voltage checks can be performed.

Once the starter is disconnected with the X5 Wiring Harness Connector also dis-connected, my approach is to continue down Zebrafive's Testing Voltage Checks. Hopefully the Red and White Wire Tests will PASS leaving the failure candidate = Y2 Fuel Solenoid. I would then reconnect the X5 Wiring Harness Connector & visually observe the solenoids plunger retract (under load) to verify it's faulty. I will report back once we see if the Starter can be disconnected. THANKS.............

 

[sriddle1]

Video of JD 4300 solenoid.

Just saw the posted video in the other/old thread....... Wow how easy was removing that Solenoid, I have to be a contortionist to get my smaller hands in there to maneuver and catch the 10mm bolts. I was surprised to see the amount of oil "lots" gushing out when he manually pushed in the rod/plunger. In my case when I pushed in the plunger, no visible oil, very clean, just a slight gurgling sound. Thanks for the video. I'm hoping in the future these threads will help someone else going down this road............

 

[Zebrafive]

I would remove K-1 Starter relay to disable the starter. As others noted the white wire to the starter with the blue crimped on terminal looks like someone picked up 12 volts from the battery at that point. There is another white "trigger" wire for the starter, but pulling the K-1 starter relay will do the same as removing the correct white wire.

 

[Zebrafive]

And make sure you use the right inputs on the meter.... You do not want your positive lead plugged into the Amperage position. It will blow the fuse in the meter.

Good catch!

 

[dieselcrawler]

Finally... hope this works... refer to post #12 for reference.