Re: 1937 120 Conv. Sedan - Blanche

Posted by TxGoat On 2024/5/12 8:20:53
The King-Seely gauges that use a resistive heating element and bimetallic "motor" are not polarity sensitive.

Another type, the "balancing coil" type, probably ARE polarity sensitive. Ford used a lot of the King-Seely type, and GM used a lot of the balancing coil type. Packard may have used both. The gauge schematic above looks to be a balancing coil type, with two tiny coils and a free-swinging needle.

When working properly, the King-Seely type will always park the needle at one end of the scale when turned off.
The balancing coil type may or may not have a default "Off" position.

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