Locate fuse replacement for dremel solid state motor speed control

How did the plugs look? If the blower was totally inoperable but replacing the blower motor and speed resister fixed it. I think you did locate the problem but I don't think you fixed everything. I recommend going back in there, remove the two connectors and look for damage. Look for stretched or over heated terminals.

Fuse for rear air ????? No air coming from rear vent's ? That would be caused by the HVAC blower motor not working . Probably not a fuse issue , if the fuse is blown you have a bigger issue . Fuse's don't just blow for no reason - electrical short circuit, too much current draw etc.. . More then likely it's a problem with the blower motor control module or the blower motor . Located behind the right rear trim panel . But go ahead an check the fuse anyway , fuse # 26 - 25 amp located in the underhood fuse / relay box . marked RR -BLWR/ 110 VAC
Auxiliary Air Speed
The auxiliary blower motor is controlled by the front auxiliary blower motor switch. If the vehicle is equipped with rear DVD (U32), the auxiliary blower motor can be controlled by the overhead console, vehicle entertainment system (VES). The front auxiliary blower switch must be in the AUX position in order to control blower speed from the VES. The VES will send a class 2 message to the HVAC control module requesting a blower motor speed.
The auxiliary blower motor control module is an interface between the HVAC control module and the auxiliary blower motor. The auxiliary blower motor speed control, auxiliary blower motor speed signal, blower motor speed control, and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 8-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the HVAC control module through a 0 to 12-volt blower motor speed signal circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed. The underhood fuse block supplies 12 volts to the blower motor through the blower motor voltage supply circuit.

The solid state relay (Figure 124) switches the high current required for operation of the electric AIR pump. Input control to the solid state relay comes from the powertrain control module (PCM).
HM1 DTC P0412: CHECK B+ VOLTAGE TO SOLID STATE RELAY

• Disconnect SSR.
• Key on, engine off.
• Measure voltage of B+ circuit at SSR harness connector and battery negative post
• Fuse # F1.11 15 amp Auxiliary fuse box -underhood

In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Hi Larry, The tool that you require parts for was discontinued many years ago. Limited parts are available from Dremel. Inside the tool is a flex coupling and spline driver. The flex coupling is # 2615294309 and the price is about $ 1.25. This is the hollow plastic sleeve about 1" long with grooves on the inside, that goes between the motor shaft and the output shaft. The spline driver is # 2615294308 for about $ 1.00. Spline driver sits on the direct end of the motor shaft. The flex coupling sits over the spline driver. Spline driver is about 1/4", hard plastic with grooves on the outside. Total shipping for orders under $ 5.00 is $ 2.50. Orders over $5.00 is $ 4.00. There could be a tax charge depending on which state you live in. Here is how to order: Call Dremel Customer Service at 1-800-437-3635 , Monday-Friday from 7 am to 6 pm central time. VISA, MasterCard or Discover to place a Visa, MasterCard or Discover order. To order by mail: Dremel 4915 21st Street Racine, WI 53406 USA 1-800-437-3635 ext. 3636

High speed only is caused bu a defective blower motor speed control solid state resistor. The resistor is located in the air ducting (for cooling) next to the blower motor under the dash on the passenger side of the car. Remove the lower dash panel to access the part. See picture below of resistor.
Cost for part is about $200.00

I had to completely dismantle my dremel because both brushes were stuck. Had to basically break them apart because they were seized solid in there.

the triac solid-state component on the board for the motor speed control is shorted and you need a new control board, unless you can find an outsource replacement triac,most companies won't sell you parts because of liability issues on internal parts of the unit

Solid-state controls change the level of power in the fan motor to control the speed of the fan. For instance, when you switch from medium to high on a solid-state fan, the speed control mechanism increases the power of the motor. Solid-state controls are generally equipped in fans with controls that have predetermined settings, such as low, medium and high.
The solid state device in or around the fan motor could be defective and in need of replacement.
https://www.hunker.com/12003281/how-does-a-ceiling-fan-speed-control-work

It could be the fuse between the brush and variable speed control switch. I have the same problem and found the fuse blown. I am hoping that I can replace the fuse without having to buy the complete speed control unit which is about $17.00 from Dremel. If yours is still under warranty you could send it back. If I can find a fuse for mine I will let you know where to get them. joatmontag