I'm having a problem with my Blue Sea ACR not combining. I have two stereo batteries that are wired together in parallel (as one bank) plus a starter battery. I added a digital voltmeter at the helm that is connected to the stereo bank. I have the stock voltmeter connected to the starting battery. I have a remote led at the helm connected to the ACR. I have the ProMariner ProSport 20 and plug it in after each use.

SO here's the problem. The ACR will not combine as indicated by the blinking led. Engine is running, stereo bank voltmeter reads 12.7 and starting battery voltmeter reads around 14v indicating that it is receiving charging current. So why won't the ACR combine?