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The Sure Power model 1202, is a 120 amp, 1 input, 2 output, Multi-Battery Isolator. Specifically designed to exceed OEM Specifications, they are equipped with Solid-State Electronics, which isolate each battery circuit and allows each battery to discharge. Battery Isolators may be used with selector switches. Isolators actually enhance battery switch applications because each battery can still be charged independently when the switch is connecting either battery. Typical Isolator with battery switch applications are shown in figures 4 and 5. These diagrams are only two of. Expert Reply Battery isolator # DW08771 will have connection posts for each battery and for an alternator. The main battery will connect to position one and the alternator to the A post. The second battery will attach to the 2 via a circuit breaker that is rated appropriately for the battery. Output from the second battery positive post will then go to the items you want to power. A battery isolator only transfers power from the alternator to a secondary battery. The van’s alternator is designed to keep a float charge (13.8V) on a starter battery as well as provide enough power to keep all of the van’s equipment running, such as lights and a stereo. A battery isolator is a one-way electrical battery that allows an electrical current to flow in one direction but not the other. A battery isolator typically is used in situations where multiple batteries are required, and its primary purpose is to ensure that the failure of a single battery will not incapacitate an entire electrical system. Battery Isolators for Multiple Batteries Battery isolators are best seen as the distribution point of an automotive electrical system. Generally built with diodes, isolators ensure that charge is evenly distributed between multiple batteries and the alternator. Battery Isolators eliminate multi-battery drain when two or more battery banks are in a charging system. Using a smart battery isolator like the CTEK D250S, there is no need to use expensive and bulky 4 awg wire as 10 or 12 awg wire is sufficient for battery charging. The Expedition Portal Wire Diagram I designed the portable dual battery system for my Ford E150 camping van and asked an electrical engineer friend to piece it together install it. For your battery isolator similar to # DW08771, you will have connection posts for each battery and for an alternator. The main battery will connect to position one and the alternator to the A post. The second battery will attach to the 2 via a circuit breaker that is rated appropriately for the battery. Output from the second battery positive post will then go to the items you want to power. 1. Ifcircuit breaker isgoing tobe used, it should be installed near the Aux. Battery and on the Aux. Load. NO circuit breaker isto be installed from alternator to isolator orfrom isolator to main starting battery. J. Connect all auxiliary loads to the auxiliary battery. For best results, use aPhoenix Gold Thermo Oil Battery. Multi Battery isolator Wiring Diagram. September 3, 2018. July 15, 2018 by Larry A. Wellborn. Assortment of multi battery isolator wiring diagram. A wiring diagram is a simplified conventional photographic representation of an electrical circuit. It shows the elements of the circuit as simplified forms, and the power as well as signal connections between the devices.