(ET) Blown diode in field circuit, E16

[Geoff Rich <grich firstsolar com>]

Hello all,

I recently managed to blow a diode in the field circuit of my E-16.  It 
physically blew up, complete with sparks and smoke!  Fortunately, it was 
the one which conducts for all reverse speeds.  Thus I still have all 
foward speeds, but whenever I attempt to run in reverse, a huge current 
flows in the amature/series field circuit, and there is insufficient 
torque to turn the motor.

I tried to read the part number on the matching "forward" diode (since 
there wasn't much left of the one that exploded), and it looked like 
IR3051C, which suggests an International Rectifier part, but I couldn't 
find a cross for this in my NTE book, or online at IR's website.  Perhaps 
I read it wrong. There are some similar numbers, like 1N3051x, but they 
cross to 1 watt devices, and the diodes on the tractor have 5 watt style 
packages and lead diameters.  

Does anyone have a parts list which might give the OEM part number for 
this?  I don't have my schematic available right now, but I think that 
this diode is designated CR2 or CR3, and it should be the same for both 
the E15 and E16 models (and probably E20, too).

Thanks for any help you can provide.  Sorry, I can't provide the full 
model number of my tractor at the moment, but I will if it is necessary.

Geoffrey Rich