C5 Corvette Charging System Fault

[@mikestlouis5304]

Awesome video just picked up a 04 Z06 same issue. I’ll be doing that tomorrow. Thank you!

[@4KMotoring]

Good luck!

[@joeoc2742]

Really enjoy all the information and tips you have provided, I thank you sir and happy motoring.

[@OMEGATECH]

I did my alternator last year, a lot easier than I expected!

[@4KMotoring]

Absolutely! Probably one of the easiest jobs I've done to the car!

[@OMEGATECH]

@@4KMotoring yeah I went with a powermaster High amp alternator from Summit Racing, the only difference is I had to get a bigger serpentine belt due to the pulley size.

[@4KMotoring]

@@OMEGATECH Did you have any issues with that? I read lots of horror stories about the C5 not liking changing the alternator output

[@OMEGATECH]

@@4KMotoring speaking for myself zero issues with that alternator and I too have heard of the horror stories and as far as the charging system is concerned my next step is a ground wiring kit from SacCityCorvettes Big 3 wiring kit for C5/C5z available for top post and side post batteries it's a complete bolt on wiring kit with no cutting or altering the factory wires

[@GregSr]

Thanks for the video. I'm sure my 153,000 mile 2003 C5 will be needing an alternator soon. No issues so far. My C5 has an RPO code K63 (Generator 110 Amp). I don't know if that means there is more than one type of generator installed in C5's. Did you run into trouble finding the right one for your Vette? Not to nit pick, but you should always disconnect the battery's negative cable first. That way you don't risk shorting the positive to some ground nearby.

[@4KMotoring]

There is more than one output level available, my reading indicates the auto transmission cars had the higher output alternators. Good point about the battery. I usually do disconnect when doing any electrical work on the car, but I guess I overlooked it this time!

[@stephendibari5010]

The beauty of a C5, that alternator would cost 3x as much if it was European or Japanese sports car !!

[@stephendibari5010]

Great job 👏. Saving for my future C5 !

[@toddmaccoy4777]

Keep it up!!!! Great work!

[@4KMotoring]

The beauty of a 20yr old car is that it gives me plenty of content

[@sxleatherco8887]

Same thing happened to me recently i changed my alt it didn’t work for long it ended up being my ignition. Did vats bypass and installed new ignition good as new! Nice video and love the c5

[@4KMotoring]

That's definitely another weak point of the C5, glad you got it working!

[@castlegarage6969]

2001 and up has the clutch like the one on left side

[@williamneal1209]

What amp output alternator did you put in. I put a new 145 Amp and the issue with charge fault and excessive voltage is now showing?

[@4KMotoring]

130 amp fits most manual transmission cars, I believe the 145 was for the automatic. Your glove box should have a sticker with the build codes, one of them specifies your alternator

[@yamaman1974]

My 2001 says - before I even start the corvette is says Charging system fault. Gauges flash and dim. Previous owner said alternator was replaced just before I bought it. I put a new AGM battery in it. Still has the same issues. Pull the key in and out a few times and then the dining stops and the alarm goes away. Any suggestions?also I have cleaned all the ground spots and connections. I just need to get to the computer under the battery and clean those connections next.

[@4KMotoring]

Mine will do this if the voltage isn't correct when starting the car. Either your battery isn't holding a charge or something in the car is draining it while it sits

[@naranjoceidy]

How do you choose the alternator?

[@4KMotoring]

Reading through the forums, there are two outputs for Auto and Manual transmission cars.

[@naranjoceidy]

@@4KMotoring which one would be for a manual c5 z06?

[@4KMotoring]

Should be the smaller output option

[@jamietrent9332]

Mine didn’t start displaying this until after I replaced my alternator and battery

[@4KMotoring]

C5 Corvette owners are certainly no strangers to electrical gremlins

[@0Heeroyuy01]

wish mine was this easy to fix. iv put a new battery, starter and alternator on my C5 and im still getting charge system fault

[@4KMotoring]

How is your voltage looking?

[@0Heeroyuy01]

@@4KMotoring volts look fine according to the both digital and analog gage, even a volts meter checks fine. fine being 13.4 to about 14.2. i'm going to clean the main ground this weekend when i have time

[@4KMotoring]

@@0Heeroyuy01 I had to get a second alternator as the car did not like something about the voltage regulator in the first one

[@hockeynut178]

Funny Enough, my voltage reading on the Dash is 0.3 Volts. At the battery when off its 12.5~ when on its 14.5~ So something is wrong between the battery and the Cluster

[@4KMotoring]

These cars are known to have bad grounds! Clean them if you can as a first set