Does your van have any custom wiring to support charging of a second battery?

> On Jan 28, 2024, at 11:25 AM, Markus Benne <mbenne@M-BASS.COM> wrote:
> 
> I've noticed a behavior where the alternator will not charge the battery (and no alternator light is on) until I hit a high rpm.    Then I hear a relay click and the voltage jumps to 13.4ish volts and the battery is charging normally.
> My usual suspects are bad ground and/or a bad relay.
> Someone hit this before?
> Thanks,...Markus