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Old 09-24-2015, 11:38 AM   #21
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My ford had this option or a heavier duty one I chose the heavier duty. The second one is for the 2nd battery and that battery is for the trailer or a camper. Mine still came with the two batteries as the RV equipment package.
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Old 09-24-2015, 11:40 AM   #22
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Gm ' s second battery option "non diesel "
Was only wired to the "rv" harness between cab and box.

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Old 09-24-2015, 01:31 PM   #23
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dual alternators or heavy duty

I am in the process of picking out a truck to pull my new Cedar Creek, weighing in at 16,500 lbs. It appears the dual alternators will charge my 4 6volts better than a heavy duty alternator while I am traveling.
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Old 09-24-2015, 01:33 PM   #24
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Gm ' s second battery option "non diesel "
Was only wired to the "rv" harness between cab and box.

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You really do not need two alternators what you need is a larger one with more amps. I had a 70 amp alternator and 4 d-8 batteries in my sail boat. It would take over 3 hours of engine time daily to make them reach capacity on a sail boat. I put in a 150 amp alternator and charged my batteries full in an hour of run time. In turn I used 1 gal of diesel compared to 3 gals for the same charge to carry me through for 24 hrs with an inverter I was running 24 hrs a day for navigation with a computer at 110v and 12 v for the refer and water maker daily. It was the highest output at that time for the marine industry bought at West Marine. When you only have a 50 gal tank you learn other way's to conserve. This was all designed by a marine engineer with the tacking solar panel system. The solar system at that time would only put out 4 amps ( should have went with a wind generator hind site as always)
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Old 09-24-2015, 02:43 PM   #25
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I am in the process of picking out a truck to pull my new Cedar Creek, weighing in at 16,500 lbs. It appears the dual alternators will charge my 4 6volts better than a heavy duty alternator while I am traveling.
How many amp's is the HD compared to the 2 standard?
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Old 09-24-2015, 02:48 PM   #26
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I would get duals over hd single.
Also, that's max amps.
You don't get that at idle.


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Old 09-24-2015, 03:50 PM   #27
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These are for vehicles with extreme electrical needs... light bars, strobes, spot lights, and so on. A lot of vehicles that have them are bought by road construction companies, fire departments, railroads, etc, with a lot of lighting needs and/or with large inverters for running power tools and equipment. RVers really don't need them for the most part. My field manager job with the railroad involved installing electrical equipment in company vehicles, and many of them had dual alternators.
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Old 09-24-2015, 05:37 PM   #28
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Thanks everyone - so, it seems like they are used for with the plow prep package and commercial uses, but not so much in an RV application.
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Old 09-24-2015, 05:48 PM   #29
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My 2014 GMC comes standard with a 125 amp alternator and the snowplow pkg has two 125 amp to supply the electric snowplow, over head flashing lights & back up lights. In my world, plowing in the dark consumes a lot of power. The 2016 GMC now has 220 amp alternator for the snowplow pkg.
Ambulances also need a ton of power and use large alternators to maintain lights and equipment. A RV doesn't need the 200-300 amps of power to function.
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Old 09-24-2015, 06:07 PM   #30
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Just did some checking in the 2013 Super Duty Pickup Dealers manual I have. With the Snowplow Prep Package you get an extra-heavy-duty alternator (200 amp) with the 6.7L Power Stroke diesel engine or heavy-duty alternator (157 amp) with gasoline engine. Minimum required equipment for Snowplow Package includes 157 amp, heavy-duty alternator (6.2L). Optional: Dual alternators 357 amp (6.7L diesel). This is what Ford says.................

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Old 09-24-2015, 06:16 PM   #31
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Besides the more is better argument, is there any specific benefit it would provide? Can it be used to charge batteries on travel trailer faster than the standard 7 pin connection?
Dualies with a camper on their back need the juice for charging the house batteries.
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Old 09-24-2015, 06:23 PM   #32
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If I'm not mistaken I believe that the Rapid-Heat Supplemental Cab Heater requires a upgrade alternator since it has electric heating element that comes on before the engine warms up. By the way I have a diesel and I have cabin heat before I can back out of the garage.
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Old 09-24-2015, 07:06 PM   #33
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My 2015 2500HD Duramax w/ snow plow package has the mandatory dual batteries and an HD alternator ( only one). In addition, unless a very heavy wire is run from the engine compartment to the 7 pin Bargman ( not the OEM wire) , it doesn't matter how many alternators you have. If you are drawing 20 amps on that cable you will get enough voltage drop to make it difficult to charge the RV battery no matter how many amps are available.
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Old 09-24-2015, 08:22 PM   #34
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Just did some checking in the 2013 Super Duty Pickup Dealers manual I have. With the Snowplow Prep Package you get an extra-heavy-duty alternator (200 amp) with the 6.7L Power Stroke diesel engine or heavy-duty alternator (157 amp) with gasoline engine. Minimum required equipment for Snowplow Package includes 157 amp, heavy-duty alternator (6.2L). Optional: Dual alternators 357 amp (6.7L diesel). This is what Ford says.................

Bob
You only missed one part. Lariat and up models got the 200A standard. I elected to just leave mine with the standard 200A. Less weight and I don't have a large electrical demand. I do not have the plow package on mine either. Salesman thought I was nuts because it's only $85, but every dually I saw with the plow package sat nose up with minimal weight in the bed, and I didn't want that.

I think Flybob nailed it, there's really no gain going back to the RV with the factory wiring. If duals makes you feel better go for it, but I don't see the need. Now most of the additional lighting being added to trucks is LED anyway and they pull a lot less amps than the old incandescent stuff.
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