Part# 07-03567
MFR Model# STS-A24


FAA-PMA APPROVED for Certified Aircraft

Continuous Duty (Aux) Solenoid. Typically used for connecting Auxiliary (Ground) Power. Activation: Varies.
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WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. www.P65Warnings.ca.gov


  • Silver Contacts provide 300A in-rush & 150A continuous-duty capability. Much higher than the original units
  • Light spring and low-current coil for excellent engagement and holding capability
  • Dual coil terminals


  • High Quality Manufacturing designed to take the beating our piston aircraft dish out
  • Upgraded to perform best with today's lightweight, high torque starters
  • Not automotive store parts with extra mystery terminals
  • Same OE terminal layout used for decades on our aircraft - simple to install
  • Silver contacts (vs. copper) for high-current capability and long-life
  • All-metal case construction


So far it is good. It was previously replaced in 2016.

Virginia H
April 21, 2020

I need to purchase two 24volt battery master solenoids. There appears to be some confusion in the online catalogue between the STS-M24 and the STS-A24. Can you please advise the correct part number for the continuous duty 24 volt battery master solenoid. It is listed as part number 07-03566 (STS-A24 )in your catalogue as a continuous duty but the specification shows this number as being an intermittent duty solenoid.

Patrick H
September 21, 2017

Work great.....no issue

Maxime D
September 5, 2017

Good quality certified solenoids

January 21, 2021

Good quality with higher amp ratings then the ones usually found at other suppliers.

June 25, 2020

It seems to be a decent product but the paperwork needs improvement. The documentation references the terminals labeled Bat and S1 and S2 but nothing is labeled on the solenoid. It also does not indicate if there is a preferred mounting position or if a diode may be required.

Edwin W
March 19, 2020

This is the second one I ordered in less than a year. The first one started giving me problems about a month ago. I didnt see any others that I could use, and some of the reviews on here rated the product very high. So I decided to try it again. Maybe I got a bad one the first time.

May 28, 2018

Be careful when using these in Cessna 150 or 152. They are not sealed, and the location below the oil door in the cowl allows water to enter and corrode the units. They stick in the ON position. The company cheerfully replaced them each time and the third time warned me to apply some sealant to the cover area and the bottom.

Cas L
March 8, 2019


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: How much does the Sky-tec STS-A12 solenoid weigh?

This weighs approximately 0.92 lbs.

Q: Does the Sky-Tec continuous duty solenoid have an integral kick diode?

The diode is not included per the vendor.

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