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It works. I just know some places rip you on f-250 parts and try to aay that they are HD when there's no differences in design or quality. We need to get the list of 3g equipped vehicles posted in a sticky. Lot's of choices out there.
Does anyone know of any 2G alternator bigger then 80 amp for the 87-92 5.8s? I asked at the local parts store and he said f150,f250 an f350 with the 5.8 are all 75 or 80 amp is the biggest they carry.
Does anyone know of any 2G alternator bigger then 80 amp for the 87-92 5.8s? I asked at the local parts store and he said f150,f250 an f350 with the 5.8 are all 75 or 80 amp is the biggest they carry.
I thought I'd heard of 90 but that's still pretty bad. 2g is a crappy design anyway, why not upgrade to 3g?
I got it all wired up and after a couple of adjustment with the temperature setting, it is working like a charm. I do get that voltage drop when it the fans start up, like Unit505, but it actually works as an indicator that the fans kicked on.
I thought I'd heard of 90 but that's still pretty bad. 2g is a crappy design anyway, why not upgrade to 3g?
Ya I looked into 3G swaps after I wrote that post , not sure how this swap got past me all these years! Lol
Looks like I'll maybe do this swap in the spring, I think ill do a dual battery swap soon because of my winch.
Too bad 99-03 f150 3G alternators wouldn't work because I have 3 of them.
I got it all wired up and after a couple of adjustment with the temperature setting, it is working like a charm. I do get that voltage drop when it the fans start up, like Unit505, but it actually works as an indicator that the fans kicked on.
Thanks to all that guided me through this mod.
Now off to next project, 3G upgrade.
Good deal! You'll see allot less voltage drop with the 3g. The shouldn't even kick in at speeds over about 45mph. I might still do an led indicator on the dash just so I know when they are on.
Not sure how many people in here did the swap with the DCC unit but dang. I love it. And my truck is definitely much more quiet, and peppy when I floor it.
Just installed my efans yesterday and I did a pretty good job thanks to all the tips in this thread. I went with the Chrysler dual fans and have a question on wiring. I'm thinking I want them to run low for the temp sensor and low for the ac, but high if both. I drew a little diagram of what I'm thinking will work. Tell me what you think. Also, where would I wire in to turn on with the ac? [MENTION=95667]unit505[/MENTION] is this similar to your set up?
Last edited by Robert Houghton; 08-11-2014 at 10:33 AM.
I believe all that the temp sensor does is to feed your gauge and ecm a reading. You still need a controller to tell the fans when to turn on and off. This is my controller and it's been in use for around two years I think. I'd have to look at my original post. This controller has been flawless. http://shop.advanceautoparts.com/p/i...fan+controller
The Chrysler e-fans are great. One fan on low will cool my single core radiator in about a minute at idle. One fan on high will cool my rad in about 45 seconds. Both fans on high run for about 15-20 seconds before the temp drops and the fans shut down. Very efficient. You should have two wires to each fan. A yellow and a green if memory serves me correctly. The larger gauge wire, seems like it was yellow, is high speed. You can simply enough test this. My AC does not work at the moment. I run both fans on high. That's where they are most efficient without the AC. If I were to get my AC fixed, I would probably run one fan on low speed, triggered by the blower motor switch. Compressor connection would cycle the fan on/off continuously and the constant startup surge would kill the battery. Low speed gives good/efficient cooling with the lowest amperage draw. I would let the other fan sit and turn on/off with the fan controller. If I ever get my AC fixed, I'll most likely run it this way. Get your controller, get a multimeter, get a $5 baking thermometer at Wal-Mart and stick it through a piece of cardboard larger than the radiator cap opening (So your thermometer doesn't fall in the rad) and hook each fan up with the ac on. Test it high speed, low speed, single and dual. Watch your thermometer readings and you will immediately see the temp rise and fall on the thermometer. The controller will cut on at one temp and cut off around 15 degrees cooler. I think mine is set at 195 on and 180 off. Find the balance between the cool ac and the battery voltage and set it.
The one issue that comes to mind,,,,,,,I can get a 20 degree drop in coolant temperature in about a minute on low speed single fan. You might experience problems if the coolant temperature continues to drop below what the ecm likes, which in most cases is 160. You can wire the ac fan to a second controller. It is adjustable from 32-250 degrees. You could set your ac fan at 170? and off at 155-160? I really need Dr. Bowtie or one of the t-stat gurus to jump in here on this one to better explain the coolant limits.
Thanks for the reply! Just finished wiring the fans including the controller thingy and it works like you predicted. Right now i have both fans coming on low speed at 190ish and off at 180 with a 180 thermostat. The thermometer and cardboard made it easy to set the controller.
I think I will take your advice with the ac when I get to it. I may experiment with different configurations to see what results I get.
Thanks again to all the guys in this thread. This is a great mod!
01-14-2014, 12:52 PM
