McFarlane Aviation Products - 5MM12

Part Number: 5MM12


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Product Details

EarthX Accessories and Components


The 12V LED has a built in resistor for easy installation and compatibility with a 10-15V electrical system.  Details installation directions are located in the EarthX manual but it is very simple. To install, connect red wire to a positive bus connection, connect the black wire to fault monitoring wire (also black) that is located on the EarthX battery.

The positive wire (red wire) of the LED should be connected to the electrical bus (12volt positive), typically to a fuse/breaker downstream of the master switch.  The negative of the LED (black wire) should be connected to the fault monitor wire (wire out the side of the battery) of the battery.



  • Color: Amber
  • Mounting: Nut and Washer (included)
  • Termination Style: Wire 20ga- 48" length
  • Voltage: 12V
  • Built in Resistor: 500 ohm, 1/2 Watt
  • Drill Bit Size: .325 or 5/16"



  • Step 1: install the 12V LED light thru a hole in your control panel.
  • Step 2: cut the black wire to length desired for your installation so the LED’s black wire reaches the battery.
  • Step 3: use a wire stripper to remove ¼” of the wire insulation so you can attach the “male” spade connector to the black wire. Crimp the male spade connector to black wire.
  • Step 4: plug the male spade connector into the end of the pigtail wire from the battery.
  • Step 5: connect the red wire to an electrical bus fuse/breaker (.25-1 AMP).  May have to untwist wire and cut to length.  Most of the time it is most convenient to connect to a fuse on the back side of the panel.  If not, it could also be connected directly to the positive terminal of the battery with a ¼” ring lug connector.


EarthX Batteries use Lithium Iron Phosphate chemistry to deliver powerful starting energy. This chemistry provides the highest, most robust performance and safest power on the market. All EarthX Batteries come standard with a BMS (battery management system) for performance, safety, and longevity.




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Frequently Asked Questions

How do I know if my battery charger is working?
Is it safe to hook up the battery to a charger and walk away?
How often should I charge the battery?
Will my aircraft lithium battery catch fire?
My battery is dead or near zero volts, how do I recharge it?
The battery does not seem to charge or hold a charge, why?

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