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Discussion Starter #22
You might see some form of a reading(probably good enough to determine if the fan should be running), but RMS is typically for an AC signal. The PWM signal to the fan motor is DC
To accurately measure a PWM signal you need an oscilloscope (doesn't everyone owns one of these???) or a meter capable of reading duty cycle.
https://www.fluke.com/en-us/learn/best-practices/test-tools-basics/digital-multimeters/how-to-measure-duty-cycle-with-a-digital-multimeter
we test with multimeter not fluke but tester i have friend have fluke i Will ask if help me test it with ur link thnks
 

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Z case fuses , on battery post : 100A / 125A / 250A ,
. All three , including shipping is $25.82, better than dealer
From:

https://theelectricaldepot.com/fuses-and-related-products/littelfuse-zcase-single-mega-starter-fuses?sort=20a&zenid=93e315a4f741d91b13b40981b4438ea0

what would happen if he unplugged the connector and put 12 volts on it to test if fan motor turns ,??
would he still need to put some voltage on the little grey wire too , to determine the speede at which the fan turns ????
( considering the fan motor can turn like a boeing ..The EcoDiesel uses a 850 watt fan (71 amps) that uses that 100amp Z Case fuse )
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another member had to replace motor fan , in this thread : https://www.ram1500diesel.com/forum/ram-1500-diesel-electrical/11214-overheat-no-rad-fan-2.html
(( same link as post # 3 ))

fan assembly : https://www.moparamerica.com/oem-parts/mopar-fan-assembly-68217820ab
 

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