(ET) Still a haunted tractor.....

[Chris Zach <cz alembic crystel com>]

Ok, this continues to be strange. Put in the new switch, tested all the 
switches, all 8 now are good. Put the tractor together, tested it. 
Worked ok for a couple of tries, but then started to do the run-on thing 
again.

The symptoms are this: When in Foward, and you go to speed 1, the 1a 
relay locks in, the FR relay goes down, and the motor starts. Let off on 
the gas and it usually stops. Go to speeds 3 or 4 then to 0, and the 
motor continues to spin in speed 1. Looking at the relays I can see FR 
drops out, which should mean there is no power going to the 1F and 2F 
solenoids. Yet it runs for about 30 seconds, then spins down, comes 
back, then spins down again finally.

In Reverse it's weirder. When you go into R the reverse light comes on, 
and the motor will go into reverse on speeds 1-4. However when you go to 
speed 0 the FR relay drops out, and the motor *IMMEDIATELY* goes to 
speed 1 forward. Even with the reverse speed still set and the reverse 
light on.

It's as if power was getting to the contactors somehow, but from where? 
They're not stuck open, if they were it wouldn't go hard to forward when 
in reverse and speed goes to 0.

It's possible my FR relay is burning out, I'll see if I have a spare 36v 
relay. But the power has to come through the start switch....

AND I just noticed there is a wire 29-00 that goes back to card 4, pin 
1. Ah great, what is that.....

C