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When the F200/F225 was introduced as the 2002 Model,
there were two lighting coils feeding the R/R,
and two output leads from it (paired in a single plug)
but it did not have an "Auxiliary output".
It also had separate relays (driver) for the LP and HP pumps:
For the 2003 Model year,
isolated "Auxiliary output" was added,
by means of a "Drive Unit Assy"
which also included 'drivers' for both LP and HP pump.
The R/R part number changed,
but it remained outwardly indistinguishable from the prior year:
In early 2003, prior to the 2004 Model year,
Technical Bulletin 02003-003 was issued,
addressing "higher than normal battery charge rate"
remedied by a new R/R AND Drive unit -
with the new parts described as
"easily identified by the blue couplers".
Naturally, these new parts were subsequently used in the 2004 Model:
Now since the voltage is regulated by the R/R,
if there are problems with voltage regulation,
then naturally an improved / redesigned R/R is required.
But we've recently wondered here,
if the Drive Unit is only providing isolation for the Auxiliary output,
after the voltage has already been rectified and regulated,
then why was a "new"/different Drive Unit required?
why not keep using the 'old' Drive Unit?
Seems to me, the answer to that is in these photos.
But that doesn't explain why these recent posters
are having problems with voltage regulation
there were two lighting coils feeding the R/R,
and two output leads from it (paired in a single plug)
but it did not have an "Auxiliary output".
It also had separate relays (driver) for the LP and HP pumps:
For the 2003 Model year,
isolated "Auxiliary output" was added,
by means of a "Drive Unit Assy"
which also included 'drivers' for both LP and HP pump.
The R/R part number changed,
but it remained outwardly indistinguishable from the prior year:
In early 2003, prior to the 2004 Model year,
Technical Bulletin 02003-003 was issued,
addressing "higher than normal battery charge rate"
remedied by a new R/R AND Drive unit -
with the new parts described as
"easily identified by the blue couplers".
Naturally, these new parts were subsequently used in the 2004 Model:
Now since the voltage is regulated by the R/R,
if there are problems with voltage regulation,
then naturally an improved / redesigned R/R is required.
But we've recently wondered here,
if the Drive Unit is only providing isolation for the Auxiliary output,
after the voltage has already been rectified and regulated,
then why was a "new"/different Drive Unit required?
why not keep using the 'old' Drive Unit?
Seems to me, the answer to that is in these photos.
But that doesn't explain why these recent posters
are having problems with voltage regulation
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