battery voltage

[dakal]

anyone know the minimum voltage a battery must have for the computer to operate correctly? this is a renix engine. thanks :wall:

[Pete M]

:hmm: What brings this question up?

[dakal]

from owning a 635bmw for fourteen years, one of the problems i had turned out to be my battery was supplying a voltage that was under the min required for the computer. replaced battery on advice of my mechanic, end of drivability problems. i have drivability problems with my mj, we checked the battery, and it wouldn't charge correctly. i am replacing the battery next week. so, i'm wondering if the batterys voltage was below the min required for the computer to operate correctly. the proof will be when i change the battery and drive it. :yes:

 

hoping :banana:

[Cheech]

The way I always check my batteries is with a load tester. It seems to be a lie detector for them. It may show 12-13 volts with a multimeter, but hit it with the load tester and it will really drop if its bad. if it holds 9-10 volts under load it should be fine.

[dakal]

we did and it failed

[Oizarod115]

it should have 12.5ish with the truck not running, 14ish with the truck running.

[garmj]

Voltages should be 12-13v static ,over 10v with a load checker on it ,13.8-14.2 with the engine running.

[dakal]

thanks for all your help. it looks like min voltage should be 11vs. this is the same as my bmw. :cheers: