dual alternators= dual volt meters - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 05-22-2013, 04:06 PM Thread Starter
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dual alternators= dual volt meters

so i bought a 2005 f350 lariate dually. and it has two alternators. and i was curious if there was a way to hook up a volt meter to each of them so i can just replace one when one goes bad instead of replacing both of them because both of them stop working. so this is my first ford so i dont know crap about them any help would be awsome thanks
jeremy
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post #2 of 11 Old 05-22-2013, 04:54 PM
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Originally Posted by 05gitsumexchevyguy86 View Post
so i bought a 2005 f350 lariate dually. and it has two alternators. and i was curious if there was a way to hook up a volt meter to each of them so i can just replace one when one goes bad instead of replacing both of them because both of them stop working. so this is my first ford so i dont know crap about them any help would be awsome thanks
jeremy
My truck also has dual alts. Not sure why you would need to replace both alts if one fails. The PCM controls when each alternator runs. I recently had to replace the lower one and ran with just the upper for a week or so. No issues and no check engine light.

Not sure how you could isolate the two charge circuits such that you could get independent voltage readings. I suppose one could install ammeters on each one and the presence of current output would indicate whether it is charging or not.

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post #3 of 11 Old 05-25-2013, 08:43 AM Thread Starter
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ya there has to be some way. i was talking to my friend and sometimes one goes bad and you dont know it and you run on ur other alternator till both batteries are drained and the alternators are both bad. so im going by that
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post #4 of 11 Old 05-25-2013, 05:12 PM
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Like stated above, you would need a ammeter. A voltmeter measures voltage which will be about the same on both alternators because they are connected together. A ammeter measures the current flow or drain. You will need a shunt style meter, basically cut each alternator wire and put a shunt in the middle. The meter will hook to each side of the shunt and measure voltage differential which in turn shows up as amps.

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post #5 of 11 Old 05-25-2013, 05:24 PM Thread Starter
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ya i understand that. the right ammeter is $222 which makes this idea deff. not worth it
http://www.summitracing.com/parts/atm-6390/overview/
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post #6 of 11 Old 05-25-2013, 05:31 PM
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If you don't mind something a bit less fancy, try ebay. You will also need a shunt.

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post #7 of 11 Old 05-26-2013, 05:15 AM Thread Starter
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thanks , but am i being a lil far fetched with this idea?
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post #8 of 11 Old 05-26-2013, 11:18 AM
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I would say just run it till one goes out, then keep only one working.



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post #9 of 11 Old 06-20-2013, 06:52 PM
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The only time you'll ever actually need both alternator is if your running something that take ALOT of amperage. Most all of the truck only have one alternator and they run just fine.


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post #10 of 11 Old 06-27-2013, 11:10 AM
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Couldn't you just disconnect one and check the voltage with the other one running? Then do the opposite for the other? Also most parts stores can check if they work by bringing it to them...


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