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#21
Question?
What should the resting Battery voltage be... after not having driven the vehicle in a few days? I am trying to determine is one or both batteries (Blue tops) are bad. One read 11.9 and one was 12.05 on the multimeter??? took a drive about 10 minutes then tested it. 12.3 and 12.45v..... uses a battery tester and they are both showing in the green, but I did not load test them yet. I thought batteries should be 12.7?
#22
All batteries will 'settle' after you turn off the engine. The resting voltage will depend on numerous factors, including the age and condition of the batteries. I have a pair of yellow tops in mine now, and they settle around 11.7v, but I have no trouble starting the engine. You can see this for yourself by watching your multimeter while the engine is running - it should be somewhere near 14v, then while watching the meter, have a friend turn off the engine. You'll see the voltage rapidly decrease, then taper off over the course of several minutes, slowly dropping another tenth at a time. About as exciting as watching paint dry, unless you're an electrical nerd like me.
For a bit of peace of mind, you could take your batteries to your favorite auto parts store and have them tested. I wouldn't be concerned just based on a resting voltage of 11.9 and 12.05.
Hope this helps!
-Shane
For a bit of peace of mind, you could take your batteries to your favorite auto parts store and have them tested. I wouldn't be concerned just based on a resting voltage of 11.9 and 12.05.
Hope this helps!
-Shane
#23