Re: 39 Packard OD solenoid

Posted by jwblazek On 2022/3/24 13:19:59

OK, I agree with most of what you are saying here.

If what you state is accurate, how does the hold-in coil get energized? Per the manual, the hold in coil is used to hold the pawl engaged in the secondary gear plate. Interesting, a few pages later, the manual states that the Hold-In coil is energized ONLY while moving the solenoid pawl in to the stationary gear plate. The purpose of the pull in coil is to assist the hold-in coil while the solenoid is engaging.
Pull in circuit OPENS when the solenoid plunger has traveled the distance and opens a set of contacts internally

The solenoid spring pulls the plunger (hence pawl) out, disengaging the OD

Per the manuals, the OD kicks in when torque on the OD is momentarily removed from the engine when letting off on the accelerator

So still getting back to my initial quandary, what activates the pull in / hold in solenoid initially?