Battery Voltage at Startup
Thread Starter
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Battery Voltage at Startup
I've noticed lately that the '92 shows 15v right after starting. It takes as much as 15 minutes of running to get to 14.2v or so. I do occasionally see 13.7 - 13.9v after about an hour at freeway speeds.
Because I don't drive it a lot in the winter. I keep a maintainer on the battery. Even with that, it still shows the 15v at start. Last fall, I had a load test done and we did it three times in succession. The battery was down to 82% of capacity after the 3rd test.
This battery is the original :eek: ! Is it on its last legs??
Because I don't drive it a lot in the winter. I keep a maintainer on the battery. Even with that, it still shows the 15v at start. Last fall, I had a load test done and we did it three times in succession. The battery was down to 82% of capacity after the 3rd test.
This battery is the original :eek: ! Is it on its last legs??
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Battery Voltage at Startup (c4cruiser)
15 volts is within range of the safe output voltage of an alternator, and if you load tested your battery and it tests good, I would just keep using it. You don't have a problem. The original battery in my 74 vette lasted 5 years.
Burning Brakes
Joined: Aug 2001
Posts: 1,238
Likes: 0
From: walled lake MI
Re: Battery Voltage at Startup (c4cruiser)
my 92 is similar, except it's a bit quicker to get it down to 14.5V (about 10 min). unfortunately for me, when my alternator kicks in about 15-30 seconds after startup, i get this nice wining noise. battery is OK, but thinking of getting a new alternator and keeping it in the back "just in case".
