1641 Solenoid wiring
 

Working on getting an abandoned 1641 going and I'm not sure about this solenoid.

The parts diagram shows this- https://i.imgur.com/55ighNp.png
That representation matches the current solenoid, with power from battery + fused line from power switch on one terminal, power to the starter on another, and a third terminal with a red wire going to the PTO. Not counting grounds of course.
Relevant electrical diagram- https://i.imgur.com/iIM6J6s.png

The solenoid (925-1426A) that replaced the original model only has two terminals + ground though. Can I use that one? If so, where does that extra red wire to the PTO switch go?

Thanks

A sol needs at least, 3 terminals to work.
The 2 large studs take the battery power through the sol contacts to the starter.
The small wire provides power for the induction coil inside that makes the contacts come together (electromagnet) when you turn the ign switch to "start"
The red wire from your PTO switch is the power wire to do that.
and it would attach to the small terminal on the sol.
Note: the sol needs a good clean ground to work (mounting ears)

Gotcha. So on this replacement solenoid, I was assuming the spade was just the ground. But that's where the PTO power wire should go, and it's just grounded through the mounting ears.

I don't understand the problem. Here is how it is wired.

No problem really, just new to all this so I wanted to be sure.

Just an FYI, there are solenoids out there with two small terminals. In that case one of the small terminals would have a wire going to ground.

Not necessarily -----

It depends on the application.
Some sol's have 2 small terminals as you mention, but one is for Ignition and the other is for activation of the sol.
The old coil ignition systems like IH/ Ford/Gm. had a resistor to the points providing 6 Volts to the points during normal operation, but had an override to provide 12V to the coil during starting.
The power for this was provided by the Ign. terminal on the sol.
They are commonly refered to a "Ford" sol. but was used by many manufactures of tractors/trucks, Etc.
You just can't assume things or ya let the magic smoke out:biggrin2:
EDIT:
Also there are 6 Volt as well as 24 Volt sol's that are positive ground, so again the application denotes the terminal identification.

Duly noted and affirmed. It was my bad for assuming that the op's question was more garden tractor oriented than vintage cars and trucks.:beerchug:

Managed to get that replaced. Cleaned up all the other wiring , checked/cleaned all the grounds, seems fine.
Unfortunately it didn't help at all really. One new thing, when I turned the key, was a high-pitched whine from the solenoid for a few seconds. Bit of smoke when that happened too, so hopefully it didn't kill itself right off the bat. Other than that, just back to clicking.

So onto the next thing I guess (starter?). 1641 with ~950 hours, I'm not sure how much time or money I really want to put into this. I'd love to get this going just as a dedicated mower.

Magic smoke released.... :bigthink: Ive never had one release 2 puffs. Test your solenoid.

Let me ask maybe a really dumb question... Does the motor spin by hand?
Maybe there is a reason other than starter being bad that its just clicking