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C5 Won't Start after running!

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Old May 8, 2020 | 03:14 PM
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Default C5 Won't Start after running!

I have a C5 1998 with 68,000 miles. It sat for a couple years before I got it last summer. I had to put a new starter on it and a new battery, I put an Interstate battery on from Costco, It has started and ran fine for most of the year until the last week or so.

It will start up fine after sitting for a couple days, and will usually start 2-5 more times in a row with ease. But if I run around town and make a few stops, where I start it uip about 5 times in about 20-30 minutes it doesn't want to crank at all? If I put jumper cables to it after a couple minutes it will start and run fine??

I did look up my codes:
40-BCM: B2592 H
AO-LDCM: B2282 H
AO-LDCM: B2284 H
AO-LDCM: U1064 H
A1-RDCM: B2283 H
A1-RDCM: B2285 H
A1-RDCM: U1064 H
BO-RFA: C2120 H C

Any thoughts would be helpful. I did look through the sticky from Bill C on electrical items and didn't see anything that matdhed with this same issue.

Thanks,

Scott
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Old May 8, 2020 | 05:09 PM
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couple quick questions. Did you put a meter on the battery and see how low the voltage drops when cranking? Do you have headers getting the starter hot?
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Old May 8, 2020 | 05:48 PM
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What does your voltmeter on the dash show, it should read 13.5volts or greater, by your description of the problem, I would suspect your charging system, aka the alternator is not keeping your battery charged.
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Old May 8, 2020 | 06:20 PM
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I do have shorty headers on that I have put on just about 3 months ago. I will check the volt meter when I am cranking.
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Old May 8, 2020 | 07:05 PM
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I’d take that battery and have it load tested first...fully charged battery is 12.66 volts !!
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Old May 8, 2020 | 07:30 PM
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It was reading 12.50 before cranking, 8.7 while cranking and started, went back up to 14.22 while running.
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Old May 8, 2020 | 07:32 PM
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8.7 cranking is LOW. Test the battery.
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Old May 8, 2020 | 07:35 PM
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Originally Posted by Scott Preston
It was reading 12.50 before cranking, 8.7 while cranking and started, went back up to 14.22 while running.

12.5 is only 85% charged...12.35 is about 50% or so !!
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Old May 9, 2020 | 05:55 PM
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They tested the battery and said it is good just needs charged. I took the alternator into them and they said it was good. I test the volts at the battery and at the alternator and they are the same so the connection seems to be good between the two. Any other thoughts? it the starter getting too hot from the headers?? I also checked the ground connections under the hood and they are good and clean.
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Old May 9, 2020 | 09:18 PM
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Originally Posted by Scott Preston
They tested the battery and said it is good just needs charged. I took the alternator into them and they said it was good. I test the volts at the battery and at the alternator and they are the same so the connection seems to be good between the two. Any other thoughts? it the starter getting too hot from the headers?? I also checked the ground connections under the hood and they are good and clean.
You can't properly load test a battery that needs to be charged. Sounds like they used one of those non load testing ones that tells them to charge and test again. I would fully charge the battery and have it load tested. You shouldn't see less than 9.6V cranking.

If the battery tests good, and if the problem started right after the header install, I would be examining if it or the wiring is getting too much heat. They do sell material to protect the starter and wiring from heat.
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Old May 19, 2020 | 03:45 PM
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I did find the problem, it was the starter!

I finally couldn't start it with a jump, so I pulled off the starter and tested it, to find out it was bad. Put a new starter in and is running good now. I charged up the battery and it seems to be holding a full charge.
Hopefully everything goes good now for the summer months of driving!!

Thanks for the feed back and help.
Scott
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Old May 20, 2020 | 08:28 PM
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Thanks a bunch for finishing the thread. Almost nothing worse than searching for an issue, finding it was seen before, but the solution was never shared.
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