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Posted on Jan 02, 2017
SOURCE: only starts in neutral/power
Another item is to check the Battery saver relay ( think it is in the cab fuse panel ).
Should be a full size ISO relay, same as trailer tow reverse circuit ( as a swap test ). This is a guess from the list of items, could also be as slosmogman posted. Think The engine compartment fuse #18 feeds part of the cab fuse panel ( not 100% sure if that is the correct fuse, should have a description in the owners manual ).
Posted on Nov 03, 2009
SOURCE: cooling fan problems
Hi Dave the ECU receives messages from sensors, one of which is a temperature sensor. When the sensor responds to a temp higher than the normal operating temp the fans are then and only then supposed to operate. They will switch in for a brief period and then turn off again. The idle speed is in direct relation to the cold start up idle requirements and specifications. When the engine is cold the idle speed will automatically increase and as the engine achieves operating temp, the idle speed will decrease inthe way you have recorded. If you start the engine and allow it to idle until normal temp is achieved the fan should cut in. The way you've desribed all systems are A okay!. Regards John
Posted on Mar 29, 2012
The electrical load on the alternator will pull the engine RPM down. It takes 10 H.P. to run the alternator. The only recourse to low RPM at idle would be to install a larger diameter pulley on the alternator. Extended idle could result in low battery charge rate. Should be fine at hi way speed. The alternator will not put out below 750 Rpm.
Posted on May 20, 2017
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