Boost/ 7s charging over 15 volts

[SHERMAN]

Have a 23 boost charging at 15.1-15.3 volts. Any ideas what would be causing this? There’s a trouble code spn 158 fmi 3 also. Thinking battery but waiting on dealer to get some in. Doesn’t hold charge very long with the display on.

 

[Murph]

Have a 23 boost charging at 15.1-15.3 volts. Any ideas what would be causing this? There’s a trouble code spn 158 fmi 3 also. Thinking battery but waiting on dealer to get some in. Doesn’t hold charge very long with the display on.

If you are looking at “voltage” on 7S display, You are seeing voltage to ECU/ injectors.

Battery charge voltage (different circuit) will typically be 13.5-14.5V. You can check with multimeter at battery terminals when sled is running.

 

[SHERMAN]

Thanks Murph