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Tractor Pulling Discussion Forum

Re: Need opinions about fan and generator changes

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Author  [Modern View]

11-02-2012 12:57:14

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Taking the mechanical fan off the engine will certainly lighten the load, but probably not enough to notice. The nice thing about electric fans is they are efficient and safe (simply cannot get fingers near the blades). That being said, most electric fans draw enough current that you will need an alternator to keep up with it. A typical one wire 12V GM style alternator will put out 63 amps max, where as a generator usually puts out around 8 amps. A 14in or 16in electric fan will likely draw over 10 amps. The alternator will not only charge the battery faster and run your electric fan, but will also have capacity to run other electrical equipment such as fuel pumps, water pumps, lights, etc. if you wish.


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11-03-2012 09:23:11

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 Re: Need opinions about fan and generator changes in reply to MMZAck, 11-02-2012 12:57:14  
I pull a MM diesel, with NO charging system at all. I have a 14" electric fan, and electric water temp guage and tachometer, and an LED under dash light that are all on one main switch, meaning they"re all on at once, including the back lights for the guages. I have an over ride (on) to turn the fan on any time, and it"s also on a thermal switch. All that being said, I have a large truck battery on it, and make sure it"s fully charged before I leave the house. It makes it through a full day of pulling, normally 2 hooks with plenty of battery left when I get home to start it on the trailer to unload. At a 2 hook pull that"s usually 3 or 4 starts. I always turn my fan on just before I take off down the track, and it runs until I"m back to the pits every time, I just let the thermal switch take over then. It"s not uncommon for my fan to run almost 5 minutes after I park. I had trouble only twice this summer. Once when I was done pulling and walked away from the tractor and forgot to turn the fan override switch off, and the second was due to not having the charger on long enough after that one, so the next pull the battery was low. I did always make sure to park the tractor in such a way that I could hook my jumper cables either to my truck or other tractor if I needed to. Hope this helps...I don"t own any gas tractors, so I don"t know how much juice you need for ignition LOL!

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