Backhoe Identifiy Ford 555 - need wiring diagram!

[BDSUSA]

FORD 555 BACKHOE

TRACTOR: 0589005 (0 maybe a C)
MODEL: DF311F
UNIT: 8J28B (1988 SEP 28 Dayshift)
ENGINE: 8007B
TRANS: 8H090
REAR AXLE: 8F27C

I need to know which flavor of 555 I have as I am in dire need of a "readable" wiring diagram. Everything I have found on the internet is unreadable once downloaded. I am unsure if this is a plain 555 or an A, B, C, or D model therefore ordering a $100+ service manual is foolish without knowing which exact model I have on hand. I really don't need the service manual just a simple wiring diagram so I can replace the wiring harness. Thanks for any help you can provide.

 

[joecdeere]

the 555B was built 85-88, 555C started in 88-92, B was a 3 cylinder engine, C was a 4 cylinder

 

[TractorTech]

Definitely a 555B by the C....... S/N as 555C was an A....... S/N
As Joecdeere said as well, 3 cylinder would be a B.
Shift on shuttle will be mechanical instead of electric, too.