MaySpare 200 Amp Mobile Audio Continuous Relay and Battery Isolator High Current Relay 12VD for Cars, RVs, ATVs, UTVs, and Boats

Function: An isolator is used to combine two batteries when a alternator is charging ( engine running) and isolate them when not charging ( engine off) so you can still start your vehicle ^^
Voltage: 12VDC/
Dimensions: 2-3/8"W x 2-3/8"D x 3-3/4"H/Power
Handling: Continuous power handling of 200 amps/ Surge
Power Handling: 300 amps ^^
Advantage: Does not create a voltage drop to the second battery like conventional isolators, reducing the natural consumption of batteries after power off, lengthens the life of the primary battery.
^^ Wrie Diagram: Connect the two small studs one to ground the other to an ignition on source from fuse box, the order on the large/ small studs does not matter ^^ handle high power demand, Provide better service, please contact us if you have any questions!