Installation manual
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 embed-
ded 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.
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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-ight testing. Be-
fore turning on the engine, it is advisable to check voltages at the following terminal connections to ensure that the wiring
is correct. Test #1 veries proper voltage values with the regulator turned off. Test #2 veries 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
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