Tornado Tempest On/Off Switch K66304680

The Tornado Tempest on/off switch (part# K66304680) is the operator switch mounted in the face of the battery housing on the TV400-W26-U cordless sweeper. Tacony lists it as On / Off Switch. It is the control the operator actually touches, and it should not be confused with the internal power microswitch (part# K66303310), which is a separate component on the electronics assembly.

The distinction matters when diagnosing a dead machine. The on/off switch is the user-facing control; the microswitch is the interlock the electronics read. A failure in either produces a machine that will not start, but they are different parts at different prices in different places, and checking which one has failed before ordering saves both.

Compatible Models for the On/Off Switch

• Tornado Tempest Wide-Area Cordless Carpet Vacuum Sweeper — Model TV400-W26-U

Symptoms that point to the on/off switch

• The machine will not start with a known-good, fully charged pack.
• The switch has to be held, wiggled or pressed hard to keep the machine running.
• It feels mushy, sticks in one position, or has lost its detent.
• The machine starts intermittently and the fault follows the switch, not the battery.
• Visible cracking, melting or discoloration around the switch body.

Discoloration around the switch body is worth acting on promptly. It indicates heat from a resistive connection, and on a 36V system that is a fault to fix rather than watch.

Fitting notes

Remove the battery pack before starting. The switch sits in the battery mount (part# K50321850) beside the contact display (part# K66340200). Photograph the terminal connections before disconnecting them — the switch will physically accept its leads in more than one arrangement and only one of them is correct. After fitting, test start and stop several times before reassembling the housing.

Twin City Vacuum has been selling and servicing Tornado equipment since 1956. Browse the full Tornado Tempest parts range, or see the Tornado Tempest TV400-W26-U machine. Manufacturer information is at tornadovac.com.

Frequently Asked Questions

What does the on/off switch do on the Tornado Tempest?

It is the operator control in the face of the battery housing that starts and stops the machine. It is a separate part from the internal power microswitch on the electronics assembly.

How do I know if my on/off switch needs replacing?

If the machine will not start on a known-good charged pack, if the switch has to be held or wiggled, if it feels mushy or has lost its detent, or if there is cracking or discoloration around the switch body.

What models is the on/off switch (part# K66304680) compatible with?

The Tornado Tempest TV400-W26-U wide-area cordless carpet sweeper. PartSmart lists it against the Tempest alone.

What is the difference between this and the microswitch?

This switch (part# K66304680) is the operator control on the battery housing. The microswitch (part# K66303310) is an internal component on the electronics assembly that the control boards read. Both will stop a machine starting, so confirm which has failed before ordering.

How do I order the on/off switch (part# K66304680) or get help?

You can add the on/off switch (part# K66304680) directly to your cart on this page, or call us at 763-535-0770. Our staff at 5415 West Broadway, Crystal, MN 55428 has been servicing Tornado equipment since 1956 and can help confirm the right part for your machine.

Questions? Call us at 763-535-0770 or visit us at 5415 West Broadway, Crystal, MN 55428.