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post #1 of 16 (permalink) Old 08-22-2019, 12:16 AM Thread Starter
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Battery

So my 68 mustang 5.0 is having some battery issues. Right now I put a volt meter on it and it shows 12.25 volt, I open the door and no lights come on I go to turn the key and nothing happens. I can jump start it with a jump battery starter but when i turn it off i don't have any power. So my question is is the battery dead? it's a 10 year old battery when I do jump start it the alternator is putting 14 volts when running.
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post #2 of 16 (permalink) Old 08-22-2019, 12:55 AM
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At 10 years I'd suspect the battery. I just replaced my 10 year old battery. It would start the car on the first or second try if it had been on the float charger, but if you needed a third try you were out of luck.

Alternatively, check all of your connections. A poor connection will cause all kinds of problems. Check the grounds and check the cables themselves.


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post #3 of 16 (permalink) Old 08-22-2019, 01:00 AM
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It sounds like you have a ground issue to me. How are you grounding the jump pack?
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post #4 of 16 (permalink) Old 08-22-2019, 01:22 AM
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Beyond any underlying issues, Id be replacing a 10 year old battery.
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post #5 of 16 (permalink) Old 08-22-2019, 02:29 AM
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At 12.25volts the interior lights should be coming on as they take very little current to work. So, i'd be looking into that a little further.
I agree with the above comments..10 years on a battery means basically that it's on borrowed time and yes by all means check all your connections to ensure they are clean and tight. Grounds are important!

I'd put that battery on a charger and charge it fully. Then pull the headlights on high for a minute or so just to remove the 'surface charge', then i'd do a load test on the battery.
I think you will find that it won't pass the load test.

I usually disconnect the battery for the above test. It assures that it isn't powering up anything in the car while being tested.

......John
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post #6 of 16 (permalink) Old 08-22-2019, 07:56 AM Thread Starter
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Thanks I have been suspecting it could be a grounding issue, when I get a chance this weekend I will put the battery to charge and check my connections to the battery.
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post #7 of 16 (permalink) Old 08-22-2019, 08:01 AM
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When you check the ground, check both ends. Remove it from the engine block, clean and reattach. Also, remove the engine to body ground, clean both ends, and reattach. Usually this second ground is on the back of the engine connected to the firewall.
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post #8 of 16 (permalink) Old 08-22-2019, 08:03 AM Thread Starter
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Ok I will do
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post #9 of 16 (permalink) Old 08-22-2019, 08:57 AM
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Remove the cables at the battery. Make the posts and the insides of the terminal ends shine. Replace the cables and tighten securely. See if that fixes your issue.

Bart

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post #10 of 16 (permalink) Old 08-22-2019, 07:11 PM
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It wouldn't hurt to take the battery to your local auto parts store and have them do a load check, then you would know if the battery is good, dying or dead.....
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post #11 of 16 (permalink) Old 08-22-2019, 10:26 PM Thread Starter
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Saturday I will take the battery to the parts store and get some new cables.
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post #12 of 16 (permalink) Old 08-22-2019, 10:39 PM
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Quote:
Originally Posted by wabarca2 View Post
Saturday I will take the battery to the parts store and get some new cables.
Insure the battery is charged to capacity and request they do a "load" test.
Good Luck...

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post #13 of 16 (permalink) Old 08-22-2019, 11:00 PM Thread Starter
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I will thanks
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post #14 of 16 (permalink) Old 08-22-2019, 11:47 PM
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After checking the grounds, I would suggest you buy the biggest battery that will fit in the tray without interfering with hood closure, tiedowns, or cable reach. Also, might be a good time to replace cables with heaviest gauge you can find. And check the electrolyte level occasionally, I've seen many a weak battery that had levels below the full level. Liquid should look cupped, not flat when looking straight down the fill opening. Always good to cover the basics.
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post #15 of 16 (permalink) Old 08-24-2019, 04:44 PM Thread Starter
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Took the battery to get charged at autozone to get charged they said it's at 60% charge capacity so it's on its last leg.
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