This looks to be the pattern:

After about 30 replies it looks like the early single fuse wiring
(diagram in the 1980-1985  manual) was used from 1980 through 83.5. The
mid-years two fuses on the door post was used from 83.5 through 85
(early diagram in the 1980-1991 manual) and the late two fuses on the
door post wiring (late diagram in the 1980-1991 manual) was used from
86 on.

One more question...

Those with 83.5-85... Water pump in the tank or under the sink?

Jim