PWM Controller for Adjustable Field wire

[sv_isara]

Hey all, so I have a beefy 200a alternator that bogs my engine down at idle at full field. I have a dc 30 amp PWM motor controller. Would that work to manually adjust the field current? If so is there anything else I should include on the circuit?

This is the one I have:
https://www.amazon.com/gp/aw/d/B071N...b_b_asin_title

[dfelsent]

Interesting idea.
I’d pay attention to a few things though.
This first one is a biggie.

The alternator likely has the field common and one battery terminal tied together. Will this device support that or does it require a floating load?

this could be a real electrical noise generator. Depends on the design

12 kHz is in the audible range. Will it be acoustically quiet?


Salt environment. Will it survive?

[sv_isara]

Regarding the field common, don't see why that would matter. Yeah tye 12khz thing is terrible design. But so are 20khz, I can hear them both. It's harder to find 24khz devices.