Those with Dual Alternators - Diesel Forum - TheDieselStop.com
6.7L Upgrades and Aftermarket - Engine Upgrading or adding OEM or aftermarket equipment to your 2011-Up Super Duty truck with 6.7L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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post #1 of 65 (permalink) Old 11-06-2011, 04:40 PM Thread Starter
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Those with Dual Alternators

Could someone with dual alts let me know where the secondary alt output goes? Does it go to the secondary (PS) battery? Also, where does the harness to the field connector plug in? I can't find any unused plugs within reach of the harness.

Any help would be appreciated (photos especially!)
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post #2 of 65 (permalink) Old 11-17-2011, 09:08 AM
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Do you have them already or thinking about adding them? Some years ago, I believe on this forum, there was a discussion about how Ford programmed the duals to alternate useage, unless draw was high enough to need both. I seem to remember it was very complicated how the computer used them. I had them on an '04 but never did any work/diagnosis on them.
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post #3 of 65 (permalink) Old 11-19-2011, 05:53 AM Thread Starter
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I have them installed - but not yet enabled. I have to visit the dealer Monday morning. I did find where everything plugs in - it's detailed in the 2011 Wiring diagrams book.

FYI - while I was checking the wiring, I discovered that on startup, the truck draws approx 80A for the engine/electronics and the cab heater draws an additional 80A for a total of 160A!!! That 200A HD alternator is already maxed!!! I'm sure it's not rated for much above 160A at idle.

Thanks,

Bill

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post #4 of 65 (permalink) Old 11-19-2011, 10:37 AM
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Is that what everything is rated at or what it draws? Anyone put an ammeter on it to check the draw at startup with the in cab heater?

But.. I can see how dual alts for the in cab heater would give you peace of mind over the one HD alternator for that application.

2011 F350 SRW 4x4, Lariat, LWB, Diesel, Nav., 5th Wheel and Camper Pkg.
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post #5 of 65 (permalink) Old 11-20-2011, 07:29 AM Thread Starter
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That is measured with an ammeter - right on the primary (200A) alternator output line, right when the truck was started, with the cab supp heater running. The draw on the truck eventually drops down to approx 58A (when warmed up) and the supplemental heater lowers it's current as the truck's coolant warms up, but the 160A is real.

You can see indiviually what each device draws by measuring the separate current at the high-current battery junction box (that's where the cab heater is fed from - off a 125A mega fuse)

The reason I did the dual alts was to run my winch (10, 000 lbs) - that can draw some serious juice - even ignoring the cab heater draw.

I'd be very interested in finding out what the 200A alternator output is rated for at IDLE. My guess is somewhere right around 160-170A.

Thanks,

Bill

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post #6 of 65 (permalink) Old 11-22-2011, 05:28 PM
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Thanks... That is beyond me as to why Ford would put in an alternator that could just handle the draw.

2011 F350 SRW 4x4, Lariat, LWB, Diesel, Nav., 5th Wheel and Camper Pkg.
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post #7 of 65 (permalink) Old 11-18-2012, 11:20 PM
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Talking Dual Alternator Wiring Install

Hi All - I am new to this forum and a new owner of a 2012 6.7 F350. I am wanting to install the second alternator on my truck. I have purchased all the parts listed in the Ford Q-161R1 bulletin. However I can't find where the electrical harness and battery wire hook up to. I see the OP found this in the wiring diagrams, however I do not have access to these and don't want to pay the stealership to hook the wiring up. I apologize for posting on a year old thread but there is very limited info for this install on the web. Does anybody have this information?

Thanks - Craig

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Last edited by Metro23; 11-18-2012 at 11:24 PM.
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post #8 of 65 (permalink) Old 12-31-2012, 10:50 AM
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Quote:
Originally Posted by Bmacs View Post
FYI - while I was checking the wiring, I discovered that on startup, the truck draws approx 80A for the engine/electronics and the cab heater draws an additional 80A for a total of 160A!!! That 200A HD alternator is already maxed!!! I'm sure it's not rated for much above 160A at idle.
I'm assuming that's without the navigation system as well? Did you have your headlights on at the time?

I'm imagining the extra load those things (plus heated seats, etc if it's cold) could place on the truck. Even worse if you have a trailer hooked up and let it idle to warm up a little before driving, as I always do when cold as well. I hadn't really considered dual alts on the new one we're looking at, but I think I'm going to now.
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post #9 of 65 (permalink) Old 01-01-2013, 12:14 AM Thread Starter
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Craig,

You can PM me and I can send you the diagram. It was REAL simple once you see the drawing. The pain in the neck is having to take it to the dealer to get it enabled. My truck was the FIRST dual-alt that was NOT done at the factory, so it took the dealer over a month to get working software to enable the second alternator... what a PITA...

rforsythe,

All the lights were on, but I don't have heated seats or the navigation system. With the second alt, the electric cab heater works faster than stock. My brother-in-law has an 2011 F-350 with the single HD alt and is not happy with how fast the electric cab heater heats up (after sitting in mine)

Thanks,

Bill

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post #10 of 65 (permalink) Old 01-01-2013, 11:21 AM
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I'm assuming that's without the navigation system as well? Did you have your headlights on at the time?

I'm imagining the extra load those things (plus heated seats, etc if it's cold) could place on the truck. Even worse if you have a trailer hooked up and let it idle to warm up a little before driving, as I always do when cold as well. I hadn't really considered dual alts on the new one we're looking at, but I think I'm going to now.
You are correct , the 200 amp HD ALTERNATOR is rated at 200 AMPS (PEAK)................the normal duty cycle is 160AMPS. My 2008 F-450 came with the dual alternator set-up because I SPECIFICALLY ORDERED IT INSTALLED . I'm an XTRA-CLASS HAM RADIO OPERATOR and have an amateur radio station installed in my truck . I went to the parts dept at my local dealership and asked all the questions before ordering . Ford Engineers programmed a complex logic for the dual alternator setup into the computer and it's rated at 357 AMPS . I hope this helps . W5DVC911

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post #11 of 65 (permalink) Old 01-02-2013, 12:17 PM
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Thanks for the added details. Dual alt is going on the order sheet.
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post #12 of 65 (permalink) Old 01-03-2013, 08:07 AM
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So whats it cost to add the second if you just have the HD alternator?
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post #13 of 65 (permalink) Old 01-03-2013, 09:17 AM
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So whats it cost to add the second if you just have the HD alternator?
I don't know . My 2006 F-350 came with the set-up ( I just got lucky ) , but I ordered my 2008 F-450 with it installed from the factory . I would be careful about installing a second alternator , even though the block comes drilled for the two alternator set-up , FORD MOTOR COROPORATION IS GETTING PRETTY CS ABOUT ANYTHING YOU ADD TO THE TRUCK AFTER IT LEAVES THE LOT , IT WILL VOID YOUR WARRANTY IF YOU ADD IT AND TIE IT INTO YOUR ELECTRICAL SYSTEM W5DVC911

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post #14 of 65 (permalink) Old 01-03-2013, 05:46 PM
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W5DVC911 - I am about to do this upgrade to my 2012. Do you have any information or a doc from Ford that says this upgrade will void your warranty? I have the FORD Service Letter Q-160R1 and it has no info about a second alt. having to be installed by a Ford Dealer. My F350 only has 6000 miles and I would hate to void the warranty or extended warranty. Thanks





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post #15 of 65 (permalink) Old 01-03-2013, 06:30 PM
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06redzo6 - I have about $552.68 in parts to add the second alternator. Not sure how much the dealer is going to charge to set it up in the PCM. The bad thing is you have to change out the secondary cooling system water pump. The alternator mounts to it.
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