Strange Battery troubles 2012 rz-2

[brodee42]

Any word? I've been following this thread as my 2012 Z3 has been doing the same. Please let me know your outcome...

Thanks
Jason

[JTs-rz2]

Any word? I've been following this thread as my 2012 Z3 has been doing the same. Please let me know your outcome...

Thanks
Jason

I have not been able to resolve. I am going to have to start replacing parts to find the problem. First the battcom. Next the battery switch. Going to be a winter project likely....

[chpthril]

Engine off: do you read battery positive voltage on both the large battery cables? Yes, proceed. No, charge battery, fix cable or terminal issue.

Yes: do you read battery negative/zero volts on the small control ground wire? Yes, proceed. No, repair wire, replace fuse or relocate to ground terminal of battery

Yes: start engine. Do you read alternator voltage on both large battery cables? This would be a voltage higher than the battery voltage read prior. Yes, proceed.

No: Do you still have ground voltage on the small control ground wire? Yes, proceed. No, ACR is bad

Yes: do you read alternator charge voltage on one of the large cables? Yes, which one? No, check at other end of cable.

Yes: if its the cable on the main cranking side of battery switch and the control ground wire is still good, then the ACR is bad.

No: bad cable feeding the ACR.

[JTs-rz2]

Engine off: do you read battery positive voltage on both the large battery cables? Yes, proceed. No, charge battery, fix cable or terminal issue.

Yes: do you read battery negative/zero volts on the small control ground wire? Yes, proceed. No, repair wire, replace fuse or relocate to ground terminal of battery

Yes: start engine. Do you read alternator voltage on both large battery cables? This would be a voltage higher than the battery voltage read prior. Yes, proceed.

No: Do you still have ground voltage on the small control ground wire? Yes, proceed. No, ACR is bad

Yes: do you read alternator charge voltage on one of the large cables? Yes, which one? No, check at other end of cable.

Yes: if its the cable on the main cranking side of battery switch and the control ground wire is still good, then the ACR is bad.

No: bad cable feeding the ACR.

Thanks for the detailed tutorial! I will start crossing off.

[kronoss]

I have the exact same problem with my 2012 Tige R20

[JTs-rz2]

I have the exact same problem with my 2012 Tige R20

Does everyone with the issue have a battcom for the charging relay??