Coyote swap alternator control with Holley Terminator X

spookywolf

New Member
Dec 28, 2020
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Dayton, OH
After doing a tremendous amount of research, I can't seem to come up with a solution. The OEM 2017 Coyote alternator is internally regulated yet it is also controlled by the ECU by a PWM signal. My standalone ECU, Holley Terminator X Max, does not have provisions for alternator control like the FRPP does. It's a 3 pin connector: 12V from ignition, lamp indicator, and field control. I've messed around in the ecu software and I can have one of the auxiliary outputs send a PWM- signal but I don't know if alternators need a PWM+ for duty cycle %.

Option I could do is get a 1 wire alternator yet I hear they aren't reliable. Either overcharging the battery or they burn up quickly. Another is to get a external regulator like XS Power XSP320 and figure out how to convert it from GM alternators to Ford.
 
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MustangIIMatt

I need something stupid to play with
Mod Dude
Mar 7, 2002
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Option I could do is get a 1 wire alternator yet I hear they aren't reliable. Either overcharging the battery or they burn up quickly.
Don't know where you're hearing that. I've been running the same 1-wire alternator since 2010.