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post #1 of 12 Old 06-14-2013, 05:14 PM Thread Starter
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alternator issues.

Hello. 06 f350 with dual alternators. Truck hard to start sometimes doesn't start, unless I jump it. Tested batteries, they were good. Tested alternators they charge good. Volts after starting are 14.1. Shut key off and tested volts on alternators and they continue to pull 2 volts even with key off. Told I need to replace alternators, they are remans with 150,000 miles. Is it alternators or something else. please help...Thank you!!
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post #2 of 12 Old 06-14-2013, 06:33 PM
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What is the voltage during cranking? May be too low for ficm to work. Alternators may be charging but not quite to where they should be.

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post #3 of 12 Old 06-15-2013, 08:04 PM Thread Starter
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Voltage during cranking was 11.2. Retested batteries under load and one came up as bad. Replaced both batteries with interstate xtp65 or something like that, supposedly there best and strongest battery. Started fine remainder of the day, well see what happens after sitting all night....
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post #4 of 12 Old 06-15-2013, 08:08 PM
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Who told you a 2 volt drain was a bad alt LOL

I bet you got it fixed the drain was the bad battery sucking down the good one

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post #5 of 12 Old 06-15-2013, 08:21 PM Thread Starter
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First shop I took it too. Said alternator was pulling 2 volts and draining the battery ??? Hopefully It is fixed. Thanks for the responses !!!
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post #6 of 12 Old 06-15-2013, 08:28 PM
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Alt pulling volts not running '
after making a good output running
Never heard anyone try that diagnosis before

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post #7 of 12 Old 06-15-2013, 08:32 PM
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Didn't know anything could pull volts :



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #8 of 12 Old 06-15-2013, 08:46 PM
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Quote:
Shut key off and tested volts on alternators and they continue to pull 2 volts even with key off
technical term may Be Yanking volts ?

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post #9 of 12 Old 06-15-2013, 08:54 PM
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Possibly a bad diode that's allowing draw when its not supposed to.

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post #10 of 12 Old 06-18-2013, 09:29 PM
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Quote:
Originally Posted by ZMANN View Post
technical term may Be Yanking volts ?

maybe he meant amps??? who knows lol
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