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Hydraulic fluid heat exchanger fans

The Relay does not cause the fan to run on low when the engine is running.

I removed the wire connector from the DDEC. I cleaned the connector and DDEC pins with electrical contact cleaner.  I checked the end of the yellow wire from inside the wire connector to the end of the yellow wire going to the relay and  I am reading 0.04ohms, so I believe I am on both ends of the same wire.  Checked both ends to ground, one at a time and read open.  In the past post, I stated I had 48,000ohms to ground on the yellow wire, now I am showing open.  I also back probed the yellow wire after connecting the connector back to the DDEC and read zero ohms to the other end and open to ground.  I started the engine and checked the yellow wire by back probing and checking the end of the yellow wire going to the relay (disconnected from relay), both showed open to ground. I believe now that the wiring from the DDEC to the relay are good and the relay functions like it should.  Looks like the issue is with the signal coming from DDEC.


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Jeff and Pam Reganall
1996 45' Newell Coach #432 Series 60, Allison 6 Speed
Towing 2012 3/4T Ram Truck loaded with the RZR XP Turbo
Yep. Thorough job of isolating the issue.
Richard and Rhonda Entrekin
99 Newell, 512
Subaru Outback Toad
Inverness, FL (when we're home Cool )

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