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Magnetic
Reed
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Magnetic Reed Switch
Looking much like a small thermometer atop the regulator’s
circuit board, the magnetic reed switch provides a durable,
sealed interface that enables the user to set basic and advanced
regulator programming features. Included with the regulator is a
small screwdriver that doubles as the regulator’s programming
tool. A small magnet embedded in the tip of the screwdriver’s
handle allows the user to activate the magnetic reed switch. By
holding the magnet to the RED dot located at the end of the reed
switch, the user allows the user to scroll through the regulator’s
various program modes and individual program selections.
Initial Pre-Flight Test And Start-Up
When the regulator is properly mounted and the regulator wiring is installed, the MC-624 is ready for pre-flight testing.
Before turning on the engine, it is advisable to check voltages at the following terminal connections to ensure that
the wiring is correct. Test #1 verifies proper voltage values with the regulator turned off. Test #2 verifies the expected
voltages with the regulator turned on.
Note: If the regulator’s BROWN ignition wire is receiving it’s switched source of voltage from an oil pressure switch,
it may be necessary to start the engine before applying test #2. If the engine must be run to accomplish test #2, be
sure that alternator is properly cabled on both positive and negative sides to the battery being charged. Failure to do
so could result in damage to the regulator and alternator.
Using your hand-held multi-meter, test the following wiring terminals for voltage:
TEST #1: Engine/Ignition Off
• Primary RED Power Wire (Terminal #3) >24V
• BROWN Ignition Wire (Terminal #2) 0V
• Primary BLUE Field Wire (Terminal #1) 0V
TEST #2: Engine/Ignition ON
• Primary RED Power Wire (Terminal #3) >24V
• BROWN Ignition Wire (Terminal #2) 12V or 24V
• Primary BLUE Field Wire (Terminal #1) 4-22V
