Help Interpreting Wiring Diagram & Using Multimeter

[sriddle1]

I would remove K-1 Starter relay to disable the starter.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.

I'll take a look, any hints where it is and by "Remove" does that mean physically remove or perhaps disconnect. Lastly, is dieselcrawler's White Wire #105 in his PIC coming off the K1 Start Relay. THANKS...........

 

[sriddle1]

Dieselcrawler, THANKS.............I'll take a look. I think the White Wire with the blue stakon was created by the previous owner to provide power to a sprayer, I followed the wire to a toggle switch and cable tied to the Roll-Over Safety Bar (forgot official name) with a connector on end. I will still take a look later this afternoon to see if I can see the other white wire similar to your..... Zebrafive might have an easier solution if I can find the K1 Relay..........

 

[Egon]

Is there a starter fuse?

 

[sriddle1]

OK, On the John Deere Parts Catalog, Model 790, Engine - 3TNV82A, Serial # 790056. Down in the Battery and Wiring Harness (790001-) Key #20 - M805280 RELAY, Qty 2 Remarks Column - STARTER, is that what we're talking about. Whenever I do an Internet Search on Starter Relay the results are always the Starter Solenoid, not the same, we're talking about the K2 Starter Relay :reading: Now I need to find one on-line to see what it looks like, the Parts Illustration Key # 20 looks like the relays attached to a bracket and a connector attaches, and then again, maybe not.......:reading:

 

[sriddle1]

Is there a starter fuse?

Egon, I didn't see one, in one of my first attempts to get the tractor started I pulled all the fuses (one at a time) checked and re-inserted. Here's the line-up from my "Official" 790 Operators Manual ....Position A-Seat Switch, B-Control Box, Fuel Solenoid, C-Warning & Turn Lights + Control Panel Lights, D,E,F,G SPARE, H-Flood Lights, I-Warning Lights, J-Tail Lights Switch, K-Headlights.

 

[sriddle1]

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

Dieselcrawler, A bit slow on the uptake but I got it, yes I see the same lead..... Did some reading :reading: "Selenoid Operation for Dummies" and I see the trigger, as Zebrafive referred to it is the #105 Wht Wire. See if I have the logic - By pulling that connection it deprives the selenoids ability to connect the 12V to the motors windings and hence "No Crank" Just what I've been looking for. Additionally, I will be able to continue with Zebrafive's Voltage Checks and be assured no issues upstream and lastly, after reconnecting the Selenoid's connector to the harness, finally closing out with your physical inspection of the plunger retract...... could you just give me a thuimbs-up with my blue text and is there anything I should observe other than a simple retract of the plunger...... AGAIN, THANK's FOR THE HAND HOLDING...........

 

[dieselcrawler]

Yer set... blue text is spot on, starter can't engage, check for plunger to pull in... it's that simple.

 

[sriddle1]

Yer set... blue text is spot on, starter can't engage, check for plunger to pull in... it's that simple.

GREAT !

THANKS AGAIN for posting the pictures along the way, and THANKS to Zebrafive for his comprehensive Step-By-Step Fault Detect/Fault Isolate Process.

TGIF :drink:.......... Hopefully, tomorrow I'll be able to identify the faulty component. Get-er-done.........

 

[Zebrafive]

Sorry for the delay getting back to this thread. The starter relay is key 20 in the drawing. Just unplug it for your test. OR you can disconnect the "trigger" wire from the starter Solenoid, if that is easier. Same result, starter will not work when key is to "Start"

There is a difference between a relay and a solenoid, but no need to get into that here.

Good luck!

 

[dieselcrawler]

Don't forget to try to push the plunger in manually if it doesn't pull in on its own. It may hold in, but not until after the key has been in the start position.

Starter disabled, stop solinoid out, plunger accessible. Key to start position should draw in plunger, and hold in with key in run position. After key has been in start position, plunger should stay retracted if manually pushed in before key off.