Current Sensors

Instead of using resistor shunts to measure battery or alternator currents, one can also use Hall effect sensors that do not necessitate to cut the cable and run the current through a shunt (more failure points). Garmin recommends the Amploc Key100 sensor. Reportedly, Dynon also recommends it. GRT sells the Key100 sensor as CS-01 ($89, includes cable though)
Shunts need 1A inline fuses for each of the two current sensor connectors, Hall effect sensors do not.
AMPLOC KEY100 Current Sensor

The Key100 sensor doesn't really have a proper Molex connector, rather it has 3 gold pins that are cut off a wire-wrap pin-header strip plus a plastic glued on that makes it asymmetric for Molex connectors. You need to cut off one of the protruding keys on the Molex connector to make it fit. You also want to scrape off the ledge at the bottom if it is binding there.


Here is a somewhat compatible Molex connector (needs small mods, see above):

• Molex 0022011032 connector housing @Digikey (in stock)
• Molex 0022011032 connector housing @RS (in stock)

22 AWG Pins

• 22 AWG gold plated 08550102 pins for Molex connector @Digikey (in stock)
• 22 AWG gold plated 08550102 pins for Molex connector @RS (in stock)

Crimper

• Adafruit SN-28B Crimper (use smallest diameter opening, floor of pin gets pushed in, lugs bend and fold when pushed into upper part)

Pins

• 1 (inner): 5V
• 2 (middle): GND
• 3 (outer): Output, 15.9 mV / Amp and 0 Amps is at 2.5V, however some were accidentally shipped out that look identical that have only 10.4 mV/A. Amploc will exchange those. Consider testing them after arrival.

Mounting

• Some have made 3D-printed holders for the current sensor, check the links on the 3D-Printed_Tools_and_Parts page. You can also use a size 24 Adel clamp (e.g.at Spruce).

See also

• this VAF thread
• this VAF thread
• this FB thread
• this FB thread