Hey all.
Need to know what is the minimum battery voltage you might expect after the truck sits unused for about a week with the nighttime temps in the 30s or 40s.
Thanks.
Assessing truck battery health
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Hegemeister, Nov 14, 2021.
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Hegemeister and Ross_Tech Thank this.
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It depends so many variables. From how clean your batteries are, to how many ecu's you have in the truck. A battery disconnect switch is a good investment if your truck is going to sit. Below 12.4 is a discharged battery, 10.5 or lower and it's junk.
Hegemeister Thanks this. -
After sitting a week in 30s to 60s temp, I measured 12.2 v
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Hegemeister Thanks this.
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They are holding 13v so far. About 1hr.
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Ross is correct, it depends on several things and batteries should be isolated and load tested individually to evaluate their condition. Generaly ideal battery voltage with the engine running is between 13.7 and 14.7V. With the engine off, you should get a reading of at least 12.6 volts. If the battery isn't fully charged, it will diminish to 12.4V at 75%, 12V when it's only operating at 25%, and down to 11.9V when it's completely discharged.
Hegemeister Thanks this. -
Just testing voltage, the time sitting should play a role when doing just a simple test.
But yeah, load testing is best, but not always convenient.
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