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Re: (ET) HELP

Klein Robert W NPRI wrote:

Thanks to Tom Kuffa I was able to swap out the broken bakelite 1A 
contactor.  Put a new 20amp fuse in the block, engaged the power switch, 
put the transmission in neutral and pushed the pedal down slowly.  The 
motor started right up in position one.  Continued pushing and the fuse 
opened with a flash.  Rechecked my install against the schematic and 
everything appears OK.  Put in another fuse... Same thing.  The fuse opens 
in the second speed microswitch.

Being as I had cooked the terminal off the heavy 1A power wire could I 
have arc/fused/damaged something else that would cause this short?

What are the recommended troubleshooting steps?
Well, speed 1 is all resistors in, contactors out. Speed 2 is where 1A is closed to bypass resistor 1. Apparently your control circuit is blowing at this point.
It sounds like the problem is in the circuit that controls the closing of 1A, and not the main wires off 1A. That's what the little 20a fuse is blowing over. So check out the small wires that are supposed to trip 1a.
If you remove those wires from the contactor, do they have infinite resistance to each other? How about to frame ground? Does the tractor go thru the speeds (albeit with resistor 1 close) with the little wires off? 

Chris