For vehicles with two batteries, Battery Isolators electrically prevent the battery with the higher charge from draining into that with the lower charge. This helps to prevent an electrical system failure. In addition, since both batteries are separated by an isolator, they can be charged simultaneously from one source. Cole Hersee offers many general-purpose isolator options rated for use with negative ground alternator systems ranging from 70 amps to 250 amps output (12-36V DC). The amp rating of each item is the maximum alternator rating. Battery isolators have a 'per leg' rating which indicates the maximum current it can deliver to either battery. All Cole Hersee brand battery isolators have a per leg rating equal to half the alternator rating. For example, Del City Item #948051, with a rating of 75A, has a per leg rating of 37.5A per leg. Please note that these products are meant to be used with negative ground alternator systems, and are not recommended for use with self-energizing style alternators.

• General purpose Isolators for 12-36V DC negative ground alternator systems.
• Rated for use with systems ranging from 70 amps to 250 amps output.
• Embedded electronic components to protect from adverse conditions.
• Integral heat sink to provide heat dissipation.