Re: Packard shopping: Reyman

Posted by HH56 On 2022/9/21 12:30:45

Quote:
On a stock Packard you can reverse polarity without much issue as long as you do a couple of things. One would be to repolarize the generator, another would be to reverse the wires at the coil so the spark stays as efficient as possible. If it is a car with an ammeter those wires also need to be swapped. Gauges are OK unless they have some modern version of an instrument voltage regulator. The way the stock single direction motors are internally connected you do not need to worry about reversing direction because both armature and field coils also swap polarity at the same time keeping the magnetic relationship and rotation direction constant. This also holds true for the reversible antenna, seat, window, and TL motors. Those have two independent but opposite wound field coils to change direction but the armature and fields are still connected internally and will maintain the designed magnetic relationship and desired direction.

Where you will possibly run into problems is if there are any solid state replacement devices installed. Any radio mods such as modules or vibrators are usually polarity specific and while there are reports the current reworked TL control switch is no longer specific I believe the first versions were. There is no absolute statement from vendors that I have seen stating that is fact though. Any relays or compressor clutches with protecting diodes would also be vulnerable. A gray area is the stock voltage regulator. Some are marked as polarity specific. No one has posted manufacturers info on exactly what makes what are essentially relays polarity specific but I suspect it has to do with composition and placement of the contact metals. If that is the case there might be a shorter life on the contacts. If the car has any replacement modern permanent magnet motors in use those will be sensitive and will run backwards if polarity swaps.

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