I'm unsure if the two share the same diagnostic procedure.... I do know that
the shop manual (and I'm sorry I can't remember what years may be involved
or if it has been corrected in DVD/CD editions) contain one inappropriate
test step. The one instance I can recall involves a cruise actuator being
diagnosed by another tech in our shop. For scheduling reasons, I was the
"benefactor" of the other techs diagnosis. The actuator didn't cure the
concern and I repeated the pinpoint test and came to the same conclusion. A
quick (well, maybe not as quick as they promise) call to "luke warm" line
revealed the bad direction.

In this case. the symptoms were, as far as I can recall, about the same as
yours and the fix was the switch on the front of the master cylinder. You'll
have to pardon my sloth in not referring to the manuals but my last customer
today was the epitomy of "the customer from hell"....

At the risk of sounding like a whiner, I'd like to recount this just to add
"depth" to the delicate relationship we have between customer. service
adviser and tech. The "subject" is an 04 F550 with a purpose built deck
(power tongs for the oil patch... sorry I wont explain, I've already
hijacked the thread once).. Park light fuse blows immediately. Since this
ubit s still covered under the B to B warranty, my first task is to divorce
the wiring on the deck from the wiring on the truck. Aside from the act that
there is about 500 pounds of ice, mud and snow trapped in the area I must
access, there is no concern. right? Well that lasts right up until the
customer becomes aware that if the concern is in the truck, Ford will foot
the bill including time to access the concern. But, if the concern is in the
deck.....

Anyway, I spent better than an hour getting things so I could at least see
the wiring and ensure that WHEN I get droolled on, it would be sort of
clean, the customer decided to unload on me. What unmitigated gall that I
would suggest that this concern may involve someone other than Ford. Looking
at the deck, it has been in service longer than the truck with abandonned
wiring all over the place... all of it MY fault.

Having enjoyed a few portions of Mr. Seagrams finest product, I felt that I
had an opportunity to add a little window into the life of a tech...

Jab me in the ribs tommorrow and I just might look at the manuals.

Uncalled for boast... my son, turned 18 on Friday the 13th, just qualified
for a mortgage on a home... fairly modest by local standards ($150K+)...
While other Dads are worried about what their kids are up to, I feel
proud...