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Old Sep 7, 2019 | 02:39 PM
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Default Battery concerns

I keep my battery on a tender while not in use it Is a die hard AGM. Today I went to charge it and just a click. The fuel pump, DIC, and underhood light all came on. I jumped it - ran it for about 15 minutes - made a quick stop - at restart I had a click but then it started on the second try.

I am on a 2h drive down to Atlantic City - what should battery volts read under normal circumstances? At the moment I’m getting 13.7 to 13.8 - should I get a new battery while I am on the road?
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Old Sep 7, 2019 | 02:49 PM
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Sounds more like a potential starter issue to me. Voltage looks good. The "easy" guess/fix used to always be try a new battery first, but with how expensive batteries are now, not so much. For the cost of a new battery nowadays, you could pay the "diagnosis" fee at a shop which will usually also go towards the repair cost. I'm guessing starter issue, but maybe someone can chime in with "common issue" knowledge.
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Old Sep 7, 2019 | 02:54 PM
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I’m up to 14 at highway speed - must have missed the connection or had the wall switch off
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Old Sep 7, 2019 | 03:01 PM
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Glad it's looking good so far, that would have sucked to ruin your trip. FWIW my voltage is always between 13.3-13.8 max while driving depending on what the fans are doing, so if you're seeing 14, I wouldn't be worried about the battery haha.
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Old Sep 7, 2019 | 03:08 PM
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Moved to C5 Tech.
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Old Sep 7, 2019 | 03:33 PM
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Could be starter. I've seen/heard that click followed by nothing before. Check your starter connections. If any of them are remotely loose, you could get the click.
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Old Sep 7, 2019 | 03:34 PM
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Originally Posted by jjc508520
I keep my battery on a tender while not in use it Is a die hard AGM. Today I went to charge it and just a click. The fuel pump, DIC, and underhood light all came on. I jumped it - ran it for about 15 minutes - made a quick stop - at restart I had a click but then it started on the second try.

I am on a 2h drive down to Atlantic City - what should battery volts read under normal circumstances? At the moment I’m getting 13.7 to 13.8 - should I get a new battery while I am on the road?
Is your battery tender made for charging AGM batteries ? AGM batteries do require a special charger. Also check your battery connections and see if any are loose. You might also have a bad alternator which can drain the battery. My 02 charges normally at 13.7-13.8 all the time and I run a AGM battery.

Mike
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Old Sep 7, 2019 | 03:41 PM
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Check voltage at the battery with a voltmeter after it has sat for an half hour or so. It should be at 12.6 or more.
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Old Sep 7, 2019 | 04:02 PM
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If you want to run the car up here to Monmouth County I can load test your battery and check the starting and charging system with my scope !!
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Old Sep 7, 2019 | 04:08 PM
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Originally Posted by C5 Diag
If you want to run the car up here to Monmouth County I can load test your battery and check the starting and charging system with my scope !!
Do this.
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Old Sep 7, 2019 | 08:07 PM
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So I’m at Morton’s and I start yakking with a C6’er - telling me about a big event in Ocean City MD...
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Old Sep 8, 2019 | 05:14 PM
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The start attempt with a click, then OK start on second try would point toward a failing starter solenoid or a failing ignition switch among others. The 14 volts en route sounds OK although voltage at the battery terminals may not be the same as DIC voltage

In my view, a bad battery usually won't provide an OK start on a re try. A loose or insufficiently tight battery side connection (FSM: 11 foot pounds) as well as corroded grounds can also present this symptom

One way to isolate would be, if a click, no start occurs, clonk the starter from above with a long insulated rod or dowel. Past pasts posts have indicated that this may allow the starter solenoid to make contact and allow a start. But not for very many more times before total failure.
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