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Here is a quick breakdown of the current functionality/design spec of the PWM controller:
Inputs:
1. 12VDC 40A max
2. Temp sender, sets fans to 40-100% power across range 195-205F
3. A/C clutch input, sets fans to 50% power when A/C is operational
Outputs:
1. PWM output to fan(s), 40-100% (16-40A)
General specifications:
PWM frequency: 3 KHz
PWM working range: 0-100%
PWM acts as current controller up to 100%, so fan speed remains constant with varying load up to 99% - an improvement here would be detecting 100% condition, then activating a relay to bypass the PWM circuit and reduce load even further.
Recommended power be fed through headlight relay, min 50A rating, relay controlled from ignition switched source. This stops the fans running after the engine is shut off...
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