Quote:
i'm also bewilldered by the "blows a fuse" statement. I do not see any fuse in the wireing diagram for the PB circuit. Only a circuit breaker.
Problem is there were several running changes in the PB circuits and the shop manual only shows ONE version of the possible schematics. It's the one AFTER the park relay was added in production, but BEFORE the control relay was eliminated.
While it is important to consider the owner's manual, followed by the shop manual and parts book, don't forget the supplemental info which can be found through this site's exclusive online
Packard Service Index. Topics relevant to the pushbutton control are neatly grouped together in the
1955-56 Index, filed under the
Twin Ultramatic category.
More specifically, you should take look at
STB 56T-25 that was issued to
Zones only (and after production had ceased in Detroit), regarding the elimination of the automatic park function and relay. You'll find that a fuse was added to the white wire, which supplies power to two wires that feed the two buss bars for the pushbuttons.
Blow that fuse and you'll get a no-crank condition, because there won't be any power from the P or N buttons to energize the starter relay. As a result, the circuit from the ignition switch to the starter remains open. This is the same result you'd get with a bad pressure switch.
Blown fuse could be the result of a problem in the actuator, no?
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