1992 corvette
Thread Starter
3rd Gear
Joined: Sep 2025
Posts: 3
Likes: 0
1992 corvette
Hello Gents,
1992 corvette put a new Napa Legend in it in June, I don’t drive the car much maybe 1k a year.
Drove it a little and it sat for a month and a half. Took it out last week and went for a ride no problems. When I got home and was inside for a while I noticed a small puddle under the battery compartment on the ground. I went out and removed the battery and it was leaking from the vents on both sides. I cleaned up the mess with some baking soda and water.
I was able to get a new battery under warranty, my friend who is a mechanic came over with a battery tester and volt meter, the battery was installed the charge said normal on the battery tester. We then put it on a volt meter it said 14.5 then went down to 14.2 to 14.3 after it warmed up for a while. The same reading my digital readout was giving me in the car. I then drove it for an hour came back and checked it on a voltage meter again it said 14.2 the same as the cars readout said.
Today when I checked the oil, I noticed acid was coming out of the vent, not as much as before, but it was starting to form in the tray, I removed the battery again.
Guys any ideas, I will replace the alternator, but it is charging at 14..2 when warmed up 14.6 cold start and 13.9 at night with lights on. I don’t believe I would get 2 bad batteries (new)
Thoughts,
I also replace the battery every year, where I store it, I can not trickle charge it, there is no corrosion on any terminal.
Thanks,
Dan
1992 corvette put a new Napa Legend in it in June, I don’t drive the car much maybe 1k a year.
Drove it a little and it sat for a month and a half. Took it out last week and went for a ride no problems. When I got home and was inside for a while I noticed a small puddle under the battery compartment on the ground. I went out and removed the battery and it was leaking from the vents on both sides. I cleaned up the mess with some baking soda and water.
I was able to get a new battery under warranty, my friend who is a mechanic came over with a battery tester and volt meter, the battery was installed the charge said normal on the battery tester. We then put it on a volt meter it said 14.5 then went down to 14.2 to 14.3 after it warmed up for a while. The same reading my digital readout was giving me in the car. I then drove it for an hour came back and checked it on a voltage meter again it said 14.2 the same as the cars readout said.
Today when I checked the oil, I noticed acid was coming out of the vent, not as much as before, but it was starting to form in the tray, I removed the battery again.
Guys any ideas, I will replace the alternator, but it is charging at 14..2 when warmed up 14.6 cold start and 13.9 at night with lights on. I don’t believe I would get 2 bad batteries (new)
Thoughts,
I also replace the battery every year, where I store it, I can not trickle charge it, there is no corrosion on any terminal.
Thanks,
Dan
Thread Starter
3rd Gear
Joined: Sep 2025
Posts: 3
Likes: 0
While I drive the car, I cycled to volts readout, left it on it fluctuated from 14.1 to 14.4
i ordered a new ac delco alternator, I was thinking maybe the voltage regulator is bad and spiking, It is 33yrs old, I’ll send it out and have it rebuilt
i ordered a new ac delco alternator, I was thinking maybe the voltage regulator is bad and spiking, It is 33yrs old, I’ll send it out and have it rebuilt
Drifting
Joined: Nov 2018
Posts: 1,800
Likes: 579
From: Mays Landing, NJ
The 14,1 to 14.4 is normal while the car is running so still a mystery as to why the battery is boiling over. Hopefully someone will come along that can provide additional information regarding what your next step should be.
Le Mans Master
Joined: Sep 2009
Posts: 6,340
Likes: 1,148
From: Vermilion OH
I don't think it would be a bad idea to pull the battery and take it up to be tested.
In the meantime, I think it would be a good idea to check the actual output voltage at the positive terminal on the alternator with the engine idling. Just ensuring that the alternator is not overcharging, despite what the gauge is reading.
In the meantime, I think it would be a good idea to check the actual output voltage at the positive terminal on the alternator with the engine idling. Just ensuring that the alternator is not overcharging, despite what the gauge is reading.
Team Owner
Joined: Aug 2008
Posts: 33,031
Likes: 6,544
From: Rochester NY
St. Jude Donor '09 thru '26
Team Owner
Joined: Aug 2008
Posts: 33,031
Likes: 6,544
From: Rochester NY
St. Jude Donor '09 thru '26
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