Re: Vacation Car - 56 Patrician

Posted by HH56 On 2022/3/31 13:02:43
Polarity is an issue with generators and one from a different car or polarity will need to be re-polarized before it will charge properly. That is easily done so not an issue but if there is a regulator associated with a particular generator, some of those are polarity specified although no one has come up with definitive info as to why the regulators are different. A polarity specified regulator may not charge a battery properly or may have a shorter life if polarity is reversed.

Polarity is not an issue on our type starters and in general, other 2 wire (power and ground) field coil type motors such as a heater or AC blower. Because of the way the field coils and armature is connected internally, the magnetic pole relationship will always be in the correct orientation to have the motor rotate the same direction. Windows, power seat and the TL are 3 wire motors with the case ground being the third wire. One wire and ground is used for a particular direction so also not polarity sensitive since internally the motor remains the same and if polarity changes, so does the magnetic orientation.

NOT SO on motors that have a permanent magnet field such as a mini or hi torque type starter. Those are polarity sensitive as is any other small permanent magnet motor used in most modern window or seat mechanisms. Some replacement blower motors also have a PM field.

The Delco starters have a pinion shift so the solenoid mechanically brings the pinion into mesh and starts the motor turning after the pinion is engaged in the ring gear. In general those have a more positive engagement and are a bit less likely to kick back on a false start. Not sure if they are stronger than the Autolites but either should be satisfactory as a spare. On the Autolite starter solenoid for 55-6, make sure it is the 4 terminal type with the extra isolated power out terminal so the ballast resistor can be connected properly for the hotter starting spark. The typical 3 terminal type solenoid does not allow that function.

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