682 seat switch

[Roy Najecki]

I'm working through problems why my 682 won't turns over but won't start. One reason may be the ignition switch and connector was a corroded and molten mess. I've got that fixed and am now doing electrical continuity tests. My question is on the seat switch. The wiring diagram says the switch is 'Normally Open' which to my mind means when the tractor is running and used, the seat is down (and switch plunger is down) there is no continuity between the Blue and Violet/White wires. In my case I have continuity when the seat is down and no continuity when the seat is up. Am I misunderstanding what is meant by Normally Open, or perhaps I have the wrong switch?

[J-Mech]

Normally open, means the switch contacts are open when the button isn't pressed. Your switch works as it should. The seat switch is not used unless the PTO is on. Better study the diagram some more.

[ol'George]

Originally Posted by Roy Najecki

I'm working through problems why my 682 won't turns over but won't start. One reason may be the ignition switch and connector was a corroded and molten mess. I've got that fixed and am now doing electrical continuity tests. My question is on the seat switch. The wiring diagram says the switch is 'Normally Open' which to my mind means when the tractor is running and used, the seat is down (and switch plunger is down) there is no continuity between the Blue and Violet/White wires. In my case I have continuity when the seat is down and no continuity when the seat is up. Am I misunderstanding what is meant by Normally Open, or perhaps I have the wrong switch?

Normally open or normally closed means untouched/ unactivated/at rest,
or,as built by manufacture, not as installed.
As for ignition switches, they are a common problem as the
spades/ connectors
corrode, making no contact or when they do, arc and get hot melting the plug as you have seen.
Do make sure both male/female connectors are clean making good contact.
Better yet, replace them, they are available inexpensively from ebay suppliers if you have not already.
Trust us, they are a problem area.
EDIT:
John types faster than me

[ironman]

Originally Posted by Roy Najecki

I'm working through problems why my 682 won't turns over but won't start. One reason may be the ignition switch and connector was a corroded and molten mess. I've got that fixed and am now doing electrical continuity tests. My question is on the seat switch. The wiring diagram says the switch is 'Normally Open' which to my mind means when the tractor is running and used, the seat is down (and switch plunger is down) there is no continuity between the Blue and Violet/White wires. In my case I have continuity when the seat is down and no continuity when the seat is up. Am I misunderstanding what is meant by Normally Open, or perhaps I have the wrong switch?

You are incorrect. The "Normal" in reference, means the condition of the switch contacts when the switch is at rest with no action operating it. So normally open for your seat switch means the tractor is sitting at rest, not running, and no one in the seat. This is what you would want so that the tractor cannot be started with no operator in seat. Your continuity readings are correct.

If I understand you right, you are saying the engine cranks but does not start? That would not be a safety switch problem because the safety switches are to prevent starter operation. Sounds more like ignition, make sure you got the correct ignition switch that you replaced.

[R Bedell]

The Seat Switch is NOT used in a normal starting of the engine.

The Seat Switch is used when the PTO is engaged. If you get off the tractor while the PTO is running, it will stop the engine.

[cooperino]

Originally Posted by R Bedell

The Seat Switch is NOT used in a normal starting of the engine.

The Seat Switch is used when the PTO is engaged. If you get off the tractor while the PTO is running, it will stop the engine.

Or if a big branch knocks ya off the machine and your hand is not on the hydro lever.. You don't have to run after the tractor

[R Bedell]

Or if a big branch knocks ya off the machine and your hand is not on the hydro lever.. You don't have to run after the tractor

Are we speaking from experience....???

[cooperino]

Originally Posted by R Bedell

Are we speaking from experience....???

I can't remember... And my head hurts

[Roy Najecki]

I've got a new OEM 925-3021 ignition switch installed, did a continuity test on each circuit at each key position per the wiring diagram, and all is okay. But the plastic connector doesn't seat all the way onto the switch which leaves part of the switch terminals exposed per the photos. Since the tractor get left out in the rain and snow, water easily gets to those exposed terminals. While I've got the gas tank out I'm thinking of filling that gap with silicone windshield sealant. I know I should put my five Cub Cadets under cover and bought a snow rated shelter for that very purpose. My wife Debra, who is pictured on my avatar, was going to help me with that but she died last year. Three bouts of cancer since she was 12 left her weak and the flu and pneumonia last year was too much for her to beat. Sigh....

Anyway, as I read the wiring diagram power gets to the coil from the ignition switch, via the seat switch. The coil also gets power via PTO clutch switch when it is turned off. Why the redundancy? Why not just rely on the seat switch to send power to the coil? Why would the engine shut down if you get off the seat when the PTO is off, since power goes from the PTO switch to the coil?

[twoton]

Roy,

I am so sorry that you lost your wife.

David