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Lamar Battery / Master Solenoid

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12V - STS-M12 24V - STS-M24
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Overview

FAA-PMA APPROVED for Certified Aircraft

Continuous Duty (Battery/Master Solenoid). Available in 12V and 24V. Activation: -(Ground) to S-Terminal. (Floating ground frame).

All stock meets Service Bulletin 72.

Features

  • Silver Contacts provide 300A in-rush & 150A continuous-duty capability Much higher than OE units
  • Light spring and low-current coil for excellent engagement and holding capability
  • Single coil terminal (other end of coil connected to Battery terminal)

Specifications

  • FAA-PMA Certified - stop using automotive parts and operating in the 'gray area' (aka. non-conformance) of the FAR's!
  • Lamar has retooled & upgraded the GOOD, "old-school" aircraft solenoids!
  • 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
  • Frequently Purchased With
  • Customers Also Viewed

Reviews

So far it’s working as planned. I also replaced my battery with EarthX the engine turns over much faster.

Cory H Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

November 12, 2024

Showed up on time and was the correct part

Tony M Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

October 30, 2024

Functions great! The terminals were shorter and smaller than the original though

Warren W Verified Purchase

Sky-Tec Sts-M24 Battery/Master Solenoid

August 27, 2024

Reasonable price for an AC part!

Robert S Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

June 25, 2024

Joseph J Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

June 12, 2024

Drop in replacement on my 1959 Cessna 180, functions as required, timely delivery, fair price. Thank you Aircraft Spruce.

Charles W Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

May 15, 2024

This was a simple drop-in install on my 74 A185F. Comes with wiring diagram. Looks like quality construction and works as advertised for my 12V system. Hope it lasts the coming 49 years, like the original.

Michael B Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

December 19, 2023

Excellent product!

Gail A Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

September 28, 2023

The product was as advertised

Thomas J Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

April 28, 2023

Las V Verified Purchase

Sky-Tec Sts-M12 Battery/Master Solenoid By Lamar

April 4, 2023

Q&A

Please note, Aircraft Spruce Australia'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 Australia 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: What is the total current draw of the solenoid when actuated?

The total current draw is 0.8 amps.

Q: What is the difference between STec-A12 and STec-M12 relays?

The STS-M12 is for the battery master. The STS-a12 is for Auxiliary master, like a GPU.

Q: What size are the power and coil terminals? Also what is the recommended mounting orientation? I note that the 11-03161 (White-Rogers) unit recommends Cap Down orientation.

The coil terminals are #10's and the power terminals are 5/16ths. It is recommended to mount per the airframe specifications. If none, it is recommended to mount with the cap up.

Q: Does this Lamar solenoid include the diode? If not do I need it and what part number would it be?

Per Vendor: This product does not include the diode. You do not need the diode for the part to work correctly, it is simply a safety precaution some like to take. The airframe manufacturer might have a diode they recommend.

Q: What is the warranty for this unit?

12 mo from date of installation of product or 500 hrs - whichever comes first. Log books are required for warranty

Q: Does this come with diode?

No, this does not come with a diode. Part # 07-26823 is the diode and it is sold separately.

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