JD 4300 puzzle

[jthibodeau89]

First check continuity or 12v on seat switch harness red wire with key in run position. Then check continuity between seat switch white wire and diode block terminal 4. One of those 2 is broken. Or your jumper was bad.

 

[Dentbla]

Thanks again 89, I get 12v+ to my seat switch harness. Continuity ok between seat switch white wire and diode block terminal 4...still searching.

 

[Dentbla]

Also, jumper on seat switch checks out.

 

[jthibodeau89]

So with jumper in you have 12v at diode block terminal 4?

 

[Dentbla]

Update, **** you 89, you were correct. When I was lifting the seat sensor up to test, it was giving me 12+volts. I rechecked everything today, hooked another wire to the seat sensor, let it drop back to normal position, and went to engine for ground, and voltage was crap. The wire to terminal connections on seat sensor were severely corroded, cut them off, cleaned wires, and put on a wire nut. Working as it should now. Will test drive and put things back together tomorrow. Thank you, thank you , thank you!!!

 

[Dentbla]

**** is dam*

 

[jthibodeau89]

Glad you found it. But i don't onderstand 1 thing. You said seat contacts are bad, but that you had a seat jumper installed. If seat jumper is installed, the seat seitch contacts do not matter.

The explanation below was written before i read your response. It is another possible issue.

If you have 12v at diode block terminal 4 with key on, and jumper installed, next check K4 engine run relay terminal 86. It should have 12v with pto on. K4 terminal 86 is the far end of diode block terminal 5 which should also have 12v with both the seat occupied and pto (or) trans on, and with seat empty but pto&trans off. You need to check both conditions. The pto off / trans neutral also feeds V1 terminal 5 so that engine will continue to run when out of the seat with pto off/ trans neutral.

Have you confirmed v1 diode block is ok? The K4 engine run relay (V1 Diode terminal 5) is fed by 2 circuits; the seat switch (V1 terminal 4), and the PTO off / trans neutral (V1 terminal 6). It sounds like whenever you interupt the terminal 6 feed, your engine run relay is cut. This will occur with a bad V1 diode block ot bad seat safety circuit.

 

[Dentbla]

Sorry, my jumper wire had .250 male spades attached to it. The connector that attached to the switch, or the jumper, was severely corroded. I would pick it up and test for 12v and it was okay. With your persistence that it was probably the problem, I did further checking and found that when I wasn't holding it the voltage would jump all over. That is when I removed the connector and used a wire nut to attach the two wires. The wires themselves were black and I had to clean them. I will print and keep your new info just in case, Thanks.

 

[jthibodeau89]

Ahhh. Wire terminals to plug on harness was bad. Got it. That was root cause. Easy fox pnce you found it. I had the pto switch on my 4300 go out. Had to jumper it to get back to the shop. New switch was about $50.

I'm making new inner tie rod ends now. Reworking a car part that cost $19 ea instead of the $100 ea that JD wants.