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'Check Charging System' message...

168
36
I scanned and followed the shop manual for the repair.A new alternator worked for nearly a year with no Check Charging Message.
Run OT and come off and get the message again.Change the battery harness, same alternator, good for the last 4 years.
I do keep a spare alternator just in case.The car was charging the whole time all this was happening.
 
8
7
Exp. Type
HPDE
Exp. Level
5-10 Years
Denver
I too am getting a service charging system soon message popping up. It does not set any codes. This started for me on the last track session of the day on the cool down lap. It now pops up the message occasionally if I just go out for a drive. I will see voltage at 14.3-14.5 normal driving then the message pops and the voltages bounce around all over the place but mostly low, like in the 11s to 14 volts.

The alternators must not like the RPMs from the track, or the heat. Stock 2019 gt350. Original battery, so maybe that is getting old but seems more like alternator?
 
I too am getting a service charging system soon message popping up. It does not set any codes. This started for me on the last track session of the day on the cool down lap. It now pops up the message occasionally if I just go out for a drive. I will see voltage at 14.3-14.5 normal driving then the message pops and the voltages bounce around all over the place but mostly low, like in the 11s to 14 volts.

The alternators must not like the RPMs from the track, or the heat. Stock 2019 gt350. Original battery, so maybe that is getting old but seems more like alternator?

same for me. I did a battery monitor reset in Forscan and the error message isn’t popping up any longer but still large voltage fluctuations up to high 14’s.
 
6
10
Exp. Type
Autocross
Exp. Level
Under 3 Years
Post Falls, ID
So I swapped out the alternator and all seems well. 14.3 to 14.6 volts. I checked for loose or visibly damaged wires and couldn’t find anything. The plug on the back was stuck and took a while and some cussing and chucked tools to get off. I never threw any engine codes but I don’t think I have the right scanner. That was pretty frustrating I suppose I’ll carry around a spare. In any event thanks for the ideas and advice. One more thing learned about the car.
 

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