Auxiliary Power Master Switch

The design of my auxiliary power system includes both a switched circuit and an always on circuit. In this post I discuss the switched portion of the system. The master switch is used to control all accessories that can be switched. This includes the ARC switch system as well as other miscellaneous items such as flashlight chargers.

The switched portion of the system is controlled by a master switch that is mounted in the dash of the Toyota FJ Cruiser. The master switch controls a blue sea solenoid (9012)  that is mounted in the engine compartment. I chose the Blue Sea solenoid because its holding draw is .13 amps. A normal solenoid will draw 3 or more holding amps.Using the solenoid allows the switched portion of the system to be much higher amperage than the switch can handle.

The system is then connected to number of fused distribution points in the FJ.


Switch $13.00
Solenoid: $164.00

Time: Included in complete system install



Tomas has lived in Colorado since age 5. Having grown up on the Western Slope of Colorado lots of time was spent in the Desert Southwest. Tomas' father introduced him to the love of 4 wheeling at an early age in the high mountains around Aspen, Colorado. While an avid Mountain Biker, Tomas and his Family enjoy adventures in the mountains and desert in the remote locations that can only be reached by 4wd. Day hikes are always a must when on the family trips. While enjoying outdoor activities he wants to share his love as a certified 4wd trainer and ski instructor. Tomas also enjoys caving and cave exploration. Tomas currently resides in Colorado Springs. 

  3 comments for “Auxiliary Power Master Switch

  1. Lou Patterson
    October 26, 2010 at 8:16 AM

    Nice! I just installed an sPod in my FJ which acts (among other things) as a fuse black, with a relay on each of 6 circuit, and isolates those circuits from the OEM system. It makes adding new devices pretty easy.

  2. dale durham
    November 1, 2010 at 8:01 AM

    Great install!

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