7.1 Basic / Load Sections 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Minimum gear - minimum gear to enable lockup
• Activation delay - wait this long after conditions are met before locking up.
The MS3Pro can drive a 5A solenoid with a high current output, or up to 3A with a PWM output. If you need more
current, you will need to use a relay.
Note that these settings are not used if you have added on a MicroSquirt using the MicroSquirt transmission
control firmware - the torque converter lock up will be tuned from the MicroSquirt’s menu instead.
7.1.8 Alternator control
The MS3Pro can control alternator voltage if the alternator does not have an internal voltage regulator or if the
voltage regulator supports allowing the ECU to adjust its voltage.
MS3Pro allows the following control modes.
• On-Off - Allows starting with the alternator off, then switching on after startup.
• Open Loop Frequency: Used for Ford alternators with internal voltage regulators that change target voltage
in response to a frequency based signal.
• Open Loop Duty: Used for GM alternators with internal voltage regulators that change target voltage in
response to the duty cycle of a signal from the ECU.
• Closed loop field control: Used for alternators that lack an internal voltage regulator, and the ECU controls
field current. Uses a closed loop PID algorithm to target voltage.
• High speed feedback field control: A different method of controlling the alternator field, similar to an electronic
version of a points type regulator. The MS3Pro monitors the battery voltage at 20 kHz and switches the field
off if it is above target voltage, and switches the field on if it is below target voltage. Often easier to set up
than closed loop field control.
If the ECU is controlling the field coil directly, we recommend running the output through a solid state relay or ex-
ternal power transistor. Many alternator field coils may require 10 amps or more, which is more than the MS3Pro’s
recommended output current.
Here are what the other settings do.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 133
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