Bad battery's? - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 09-25-2017, 06:06 PM Thread Starter
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Bad battery's?

It starting to get cold and my truck is cranking slowly. The voltage is dropping to around 8.9 volts cranking. Sound like battery's are bad?

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post #2 of 7 Old 09-26-2017, 05:20 AM
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I hope that is a statement and not a question.

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So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #3 of 7 Old 09-26-2017, 07:23 AM Thread Starter
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I hope that is a statement and not a question.
No a question. I didn't know what it should be with the glow plugs still sucking juice.

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post #4 of 7 Old 09-26-2017, 07:27 AM
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Gotcha, 11Vs is the norm with GPs firing.

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Originally Posted by djmaguire View Post
So says the internet... ...and so it shall be.
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Originally Posted by G8orFord View Post
OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #5 of 7 Old 09-26-2017, 03:22 PM Thread Starter
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Gotcha, 11Vs is the norm with GPs firing.
Ok guess I should have worded my question differently. I know that key on not cranking voltage is 11.3. Cranking with glows plugs going drops to 8.9. Your saying it should maintain 11 volts?

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post #6 of 7 Old 09-26-2017, 03:41 PM
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The GPs have a significant battery load (up to @150A) and the reason we have Two batteries. So, YES, 8.9v is way too low and good batteries will run the plugs AND crank the engine over at the same time maintaining 10+v.

If they're over 5yrs old and doing this I would just replace them Both (should always be done in pairs). If they're newer than that then I would have them Load Tested, at a High Rate (not one of those dinky 100A testers the parts stores use, out Big batteries need to be loaded to @300A to properly test them).

So charge them up fully and have them individually tested at some place with the right tester or maybe consider Harbor Freights 500A tester for @$40 w/coupon...
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post #7 of 7 Old 09-26-2017, 03:46 PM Thread Starter
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Originally Posted by NoRalPh View Post
The GPs have a significant battery load (up to @150A) and the reason we have Two batteries. So, YES, 8.9v is way too low and good batteries will run the plugs AND crank the engine over at the same time maintaining 10+v.

If they're over 5yrs old and doing this I would just replace them Both (should always be done in pairs). If they're newer than that then I would have them Load Tested, at a High Rate (not one of those dinky 100A testers the parts stores use, out Big batteries need to be loaded to @300A to properly test them).

So charge them up fully and have them individually tested at some place with the right tester or maybe consider Harbor Freights 500A tester for @$40 w/coupon...
Alright thanks just gonna buy 2 new interstates.

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