Isolator's

Ultra smart ... Redodo

Smart...Cole- Hersee 48525

Standard ... Cole-Hersee 24590-8

Cole-Hersee uses silver contacts not copper.

Big battery, small alternator, to protect alternator a  DC to DC charger....Victron  Orion TR 12/12- 18A

There other Dc to DC converters

The service records that came with our ‘91 showed a pattern of alternator replacement in the springtime.

About when someone would go start it up with a dead house battery and cook the 70A alternator.

Such as this REDODO? Or if this ain't one that'll work, can you please direct me to one that will. I'd appreciate a link 😀 TY!