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post #1 of 12 Old 11-18-2013, 02:45 PM Thread Starter
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Need help on 2 things?

I have 2 issues going on with my 08.

1st in the last 2-3 weeks my truck is alittle sluggish to start. It used to just crank right up. No hesitation just boom started. Now it's not the same just seems sluggish to start.


2nd when I start it I get a "check brake system" pop up on screen just for a split second and it goes out. I have no codes and if I run system check it all says ok.

Any ideas or help would be great. Thanks Chris
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post #2 of 12 Old 11-18-2013, 02:54 PM
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Check your batteries. Low voltage will cause both issues

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post #3 of 12 Old 11-18-2013, 02:59 PM
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^bing bing... We has a winner.
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post #4 of 12 Old 11-18-2013, 06:48 PM Thread Starter
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Thanks for help. I had thought batteries but they are less then 2 yrs old so thought it must b something else. What's best way to test them and what #s on voltage am I looking for. Thanks C
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post #5 of 12 Old 11-19-2013, 04:41 PM
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Without a proper tester, the only way is with a voltmeter. With it running, you should have 13.5+ remove one positive off a battery and check again (not at that battery you disconnected). Connect it, then remove other positive and check again. Shut it off, wait a couple minutes, remove a terminal, check the battery only, should have 12 to 12.5. Connect, remove a terminal off the other battery and check the other battery. Also check voltage while it's cranking. Should be over 10.5. Check while cranking again the next morning to see how the batteries hold their charge.

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post #6 of 12 Old 11-19-2013, 04:45 PM
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Was about to post this exact thing. Good to know.

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post #7 of 12 Old 11-19-2013, 04:53 PM
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Best is to just run by an auto parts store if you don't have a load tester handy and let them load test the battery. It could be only one battery having a cell go bad

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post #8 of 12 Old 11-19-2013, 04:54 PM
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is it best to replace both or go one at a time?

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post #9 of 12 Old 11-19-2013, 06:06 PM
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Do both at the same time.

Quote:
Originally Posted by bjs505 View Post
Of course I'm handy under the hood, I currently own a cummins.

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post #10 of 12 Old 11-22-2013, 04:40 AM Thread Starter
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Ok..... Batteries r good. The "check brake system" message is still coming up. It driving me crazy. Also all lights in cab turn on just for a second when I start it. The the message and lights go off. It doesn't do it every time. Seems to be when it's cold or has set for awhile. Will the brake switch show this message if it is going bad?
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