MTFCA Forum

This may be of interest. Although it if for a Model A, the technology is similar to the Model T.

The Cutout

In its simplicity a cutout is a magnetically controlled switch that provides a path for current flow from the generator to the battery. The cutout permits charging of the battery when the engine is running and prevents the battery from discharging when not.
http://modelabasics.com/Cutout.htm

Or update to a diode:
https://forums.aaca.org/topic/374300-ge ... -to-diode/
https://forums.aaca.org/topic/308694-ge ... hupmobile/

Up grading a mechanical voltage cutout can be accomplished with a silicon diode. One that is suggested is a NTE6094 Silicon Schottky Barrier Rectifier.

Checking web sites for various clubs and automobile clubs share similar information.

The diode can be found on line with prices from $5.00 to over $15.00 (USD).

The spec sheet includes this information:

Description:
The NTE6094 is a Schottky barrier Rectifier in a DO5 type package designed for use as a rectifier in low-voltage, High-frequency inverters, freewheeling diodes, and polarity-protection diodes.

https://www.nteinc.com/specs/6000to6099/NTE6094.html

https://www.electronics-tutorials.ws/di ... diode.html

https://forums.aaca.org/topic/330163-ho ... placement/

also available through T suppliers

You can purchase a new, fully functional diode from the Nu-Rex company. It is not a mechanical cutout. It is solid state with an internal diode. Cost is only $62.25 plus shipping. I ordered mine on a Thursday and received it Saturday. My car is back on the road.

DHort wrote: ↑

Sun May 15, 2022 2:49 pm

You can purchase a new, fully functional diode from the Nu-Rex company. It is not a mechanical cutout. It is solid state with an internal diode. Cost is only $62.25 plus shipping. I ordered mine on a Thursday and received it Saturday. My car is back on the road.

Its just the internal diode that makes it solid state, nothing else is needed. Diodes generate heat when functioning - a "heat sink" can be anything used to dissipate heat, a finned aluminum block or even the bracket the is mounted to and the cut-out body. There isn't much room inside the cutout.
An additional plus is that the body is cadmium plated. Its a good choice for those not wishing to mess with upgrading their old one.
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NOTE: The advertise that is it capable of handling up to the full 20 amps that a Model T generator can produce. it is recommended that a Model T generator should operate in the 5 -10 amp range. A cut-out is not a Voltage Regulator so if your ammeter is showing more than 7amps your overcharging your battery - Turn the lights on.