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Since you have 2 batteries, you might consider installing an Automatic Charging Relay (ACR). An example I'm currently installing on my 1985 Outrage 18 is:

https://www.bluesea.com/products/7601...24V_DC_65A

This device helps maintain safe charging of two batteries, combining when appropriate and isolating when one or more is in an over/under voltage state. It also can isolate your house battery and associated electronics during starting. A status light lets you know when it is isolated (typically due to one battery being discharged), so you get a heads up and don't combine to start. There are other more sophisticated models that prioritize charge to one of the batteries.

I'm using this in conjunction with:

https://www.bluesea.com/products/6011...ch_-_Black

which normally has the house and start batteries isolated, but with a provision for combining if need arises.

Dennis