Battery Balance Light

[grantracy]

ok guys, that sounds about right...just never noticed it before.

[Joe Camper]

I was asked to look at a battery imbalance light issue and found this.

The chassis Batts show 26v and the starter just clicks.

Long ago when they first bought the bus they had installed a 24v marine battery tender, a small 5amp trickle charger for the chassis. It's green light also showed on, no red light all good.

Then I stuck both separate 12 volt pairs of batteries and 2 were at 15v and 2 were at 11v. Amazing to me that the little trickle charger could get the good 2 overcharged enough to make up for the weak 2. Or, is this charger gone bad too??

After separating the bank and leaving it overnight 2 were at 12.9v and 2 were 10.8v.

If there were 2 separate 12v trickle chargers instead of 1 24v on the chassis batteries the bad battery would have possibly surfaced sooner.

[GoneCrazy]

My balance light will come on for a few seconds after startup, then goes off. It never used to come on , So when it started a few months ago. I was hoping that the equalizer was not going out. My chassis batteries are 4 years old however. And have never had a tender charger on them. I suspected that it might be an early indication that the old chassis batteries are coming to the end of their life. Time to test them and replace most likely ..........

[Gil_J]

Not knowing where the 2 low voltage batteries were in the bank, it could be an equalizer problem. If the low voltage batteries were both on the lower 12V half bank, I would check the equalizer.