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Old 09-23-2015, 08:33 PM   #11
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My 2500HD diesel (non-plow-prepped) came with dual batteries. Maybe its also part of the Canadian cold-weather package... running glow plugs and cranking a 6.5 diesel with 15w-40 oil at -30 takes a lot of power. Sure is expensive when you have to replace them in pairs!

You only need the second alternator if you need to power a lot of stuff, like an ambulance body, as was said. A trailer would be incapable of consuming the extra power that could come from a second alternator - the fuse would prevent it and the wiring's not heavy enough.
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Old 09-23-2015, 08:43 PM   #12
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Had that option for my 2010 when I ordered it, I said pass.
I saw no need for it and did not want to add the extra weight.
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Old 09-23-2015, 09:15 PM   #13
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Didn't know that you could factory delete the second battery in a duramax?

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Old 09-23-2015, 09:24 PM   #14
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My f 250 Sd has 2 alternators. It was part of the ambulence/snow plow package. I cant see any advantage unless you are selling re-manned alternaters. One went out,the other failed in a couple weeks. The bottom one took 2 hrs to r&r because of all the other stuff in the way. Then there is the belt.................a different belt that was proprietory,only available thru ford. I always carry a spare now! I dont think it does squat for plowing,mines been plowed since new and the rt side batt that the plow is connected to always goes first.
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Old 09-23-2015, 09:29 PM   #15
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Originally Posted by retiredcamper47 View Post
When I plug in my tt to my F150 at the storage yard, the battery lights on the control panel will only show 2 or maybe 3 lights. When I plug in with my F250 with dual alternators, all four lights light up for the battery on the control panel. Just my observation.................

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This could for a couple of reasons. Some newer trucks change the charge voltage when they detect a trailer connected. Also the 3/4 ton may have a large gauge cable from the fuse block to the 7 pin connector.
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Old 09-24-2015, 02:10 AM   #16
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Didn't know that you could factory delete the second battery in a duramax?

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I don't believe you can, two are a must with the diesel


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Old 09-24-2015, 03:37 AM   #17
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Quote:
Originally Posted by retiredcamper47 View Post
When I plug in my tt to my F150 at the storage yard, the battery lights on the control panel will only show 2 or maybe 3 lights. When I plug in with my F250 with dual alternators, all four lights light up for the battery on the control panel. Just my observation.................
The control panel battery level LEDs are relevant only when there is no external power source. I suspect the TT's battery was way down when you plugged the F150 in.
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Old 09-24-2015, 06:32 AM   #18
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I don't believe you can, two are a must with the diesel


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I had one battery that was dead, it worked fine in warm weather but it wouldn't crank in cold I bought my truck used, and found that they only replaced one battery not both to just sell the truck. So I know FORD will work off one battery they are just hook-up in parallel. The other batty wasn't shorted but could not hold a load at all.
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Old 09-24-2015, 12:23 PM   #19
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extra alternator

my tractor trailer has six batteries ,94 lights, fridge , microwave, 2nd ac unit ,tv ,dvd , xbox and only one alternator . why the heck would a little tiny pickup need 2 alternators .
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Old 09-24-2015, 12:31 PM   #20
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For RV purposes it would be a negative in my opinion. Extra cost to replace and one more bearing waiting to seize and leave you stranded.
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