C6 charging intermittent "Voltage Too High" - 17+volts - Ideas?
09-23-2017, 01:26 PM
#21
1st Gear
Member Since: Sep 2017
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I have C6 06
Fuse #2 horn/alt sense was blown. The horn stop working two days before this started. I checked the voltage on the alternator n battery and getting a reading of 15.7v to 18.7v. The horn is bad sounds like if under water. Replaced fuse n horn problem fixed! ����
Fuse #2 horn/alt sense was blown. The horn stop working two days before this started. I checked the voltage on the alternator n battery and getting a reading of 15.7v to 18.7v. The horn is bad sounds like if under water. Replaced fuse n horn problem fixed! ����
07-30-2022, 09:54 PM
#22
Le Mans Master
Member Since: Aug 2002
Location: Ventura County, CA
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St. Jude Donor '05-'06,'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23
It's very safe to say.....that your alternator is no good.
07 Corvettes have a tendency to have alternator problems.
If you have ever made WOT accelerations to redline with aggressive shifts
then you have the potential to kill an 07 Corvette alternator.
I have at least 4 or 5 alternators FROM 07 CORVETTES ONLY that failed immediately after WOT shifts.
The centrifugal forces inside the alternator (keep in mind that the cooling fan of the alternator is INSIDE the unit and not outside) cause the cooling fan to "GROW" with high rpm and cause the fan to short against the field windings causing the regulator to fail, the diode to fail, or the field to become directly shorted.
Sometimes they will smoke, smell like burnt plastic, or just not charge.
I have seen on occasion that they set a "service charge system" message and code and after clearing the code they drive fine for years....
Trust me.... 07's don't last.
Chuck CoW
07 Corvettes have a tendency to have alternator problems.
If you have ever made WOT accelerations to redline with aggressive shifts
then you have the potential to kill an 07 Corvette alternator.
I have at least 4 or 5 alternators FROM 07 CORVETTES ONLY that failed immediately after WOT shifts.
The centrifugal forces inside the alternator (keep in mind that the cooling fan of the alternator is INSIDE the unit and not outside) cause the cooling fan to "GROW" with high rpm and cause the fan to short against the field windings causing the regulator to fail, the diode to fail, or the field to become directly shorted.
Sometimes they will smoke, smell like burnt plastic, or just not charge.
I have seen on occasion that they set a "service charge system" message and code and after clearing the code they drive fine for years....
Trust me.... 07's don't last.
Chuck CoW
Sorry for the necropost but this is the exact issue with my 07 Z06 and after some searches this post seemed to have my symptoms/fix so adding some info. All this started about 18months ago: My 2007 Z06 had been running perfectly, actually broke into the 9s(9.97@137mph) that day BUT after some hard runs, OEM alternator took a dump, it was the voltage regulator inside the alt after some troubleshooting - I had these symptoms right after some runs, heading home:
Smelled burned plastic
High Voltage (about 17-18vDC)
DIC message stating that "Service charging system"
DIC messages stating that ABS needs servicing
Radio turned off
AC turned off
Heads up display turned off
I replaced the battery initially since it was an old batt and replaced the alternator with a Mechman "S" Series 240 Amp Alternator and all was fine for about 18months.
Issue just returned this past week. SAME EXACT SYMPTOMS as above; all after some runs & high revving pulls. Suspect the voltage regulator inside the alternator but will double check everything else. Calling Mechman on Monday and seeing if they can service the alt soon, in the meantime I'm double checking any fuses, wiring at the fuse box and starter.
07-30-2022, 10:41 PM
#23
Race Director
Member Since: Mar 2011
Location: SW Florida
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2021 C6 of the Year Finalist - Modified
About 4 months ago, the alternator in my 2011 GS (with 25,000 miles) took a dump.
High voltage caused by a failed voltage regulator inside the alternator.
Here is the thread I posted that tells the story ...
https://www.corvetteforum.com/forums...e-driving.html
High voltage caused by a failed voltage regulator inside the alternator.
Here is the thread I posted that tells the story ...
https://www.corvetteforum.com/forums...e-driving.html
