I recently replace the alternator on my 2005 C6 Coupe 32K miles with a Mechman 170 Amp . I have been at 14 to 14.6 amps since install, at idle and higher RPM's. a few times since I have had a Service Charging System warning appear. The first time the car was sitting for hours in direct sunlight on a warm day for hours, shortly after start up the service message appeared, I was at idle for an extended period, watching my voltage drop into the 11's, after restarting the car and driving the car the voltage returned to the 14's. I took the car into Dobson performance had it checked out and all was well. A few months later on a very hot 90 plus degree day in stop and go traffic it happened again. After letting the car cool off it has been fine. Mechman claims this is a common condition for the C6 when hot. I never had this problem with to stock alternator.
Has anyone seen or had this issue?

 

Is Mechman claiming this is a common condition when their alternator is installed? Is so, what would be the point of installing their alternator? You can get the same crappy performance with the OEM alternator when it gets heat soaked. I hope you pursue this with them and report back. It was next on my upgrade list.

 

While I’m not totally certain it’s the same issue, it does sound similar to what I went through a couple months ago. The charging system warning would come up as my voltage dropped to around 11.1 or lower. If I gave the throttle a nice push coming off a light it would jump back to 14v and very slowly drop over 20-30 minutes time, unless I did it again.

In my case it ended up being either the fact that wires to the starter were lose, and dirty, or the starter solenoid itself. In either event I broke the head of the starter solenoid when attempting to tighten those wires due to how dried out it was.

long story short, it was lose wires or a bad solenoid. Replaced the starter and solenoid and have not had an issue since.

here’s the thread I started regarding the issue:
https://www.corvetteforum.com/forums...-question.html

The electrical systems in these cars are complex, and have all sorts of strange failures/gremlins from seemingly unrelated sources. Never know. It could be an easy wire tightening fix.

 

Just talked to Mechman, he strongly suggested I check the connections. If the connections are tight he will gladly take the alternator back and exchange if it is faulty.

 

I replaced the Mechman 170 Amp about a year ago.

There was no abnormality until a while ago, but recently, in the summer, there was a strange symptom that suddenly fell to 11v and then went up to 14v again.

The symptoms occurred for about two weeks, so I replaced the start motor and the battery, but the symptoms continued to appear.

It was a pre-alternator symptom before the alternator failed.

The symptoms continued to appear for about two weeks, but on the last day, it no longer went up from 11v to 13v, and 11v continued to appear.

I went to the maintenance shop in a hurry and the alternator broke down. So the symptoms disappeared after being replaced with a new alternator.

I've been using it for about a year and it's already broken

I visited the shop to repair the alternator and opened it, and the contact part was burnt and melted.



I am disappointed that the Mechman alternator is only this durable.

I couldn't get the AS because this is Korea. So I sent an email to the person in charge and asked him to let me buy a regulator because I would repair it here, but he was rejected.

The symptoms of your car are the same as mine. Get it repaired before the alternator is completely broken.

I envy you who can receive AS.
I hope you get good results.