12V 200 Amp 4 Pin Heavy Duty Relay

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Note for dual battery installation with a DC/DC charger when using a lithium starter.  Please ensure there is a relay on the supply side to the DC/DC (main positive cable from start battery to the dc/dc) that is only closed/on when the vehicle is running. 

We use the NARVA 200A heavy duty as a preference but any relay above the rated input of your DC/DC will work fine connected to an ignition source.  These are a capable and robust relay with the bonus of threaded posts for an even more sturdy install.

With the slightly higher resting voltage of lithium starter batteries, the DC/DC needs to be disconnected from supply when the engine is not running to ensure the lithium starter doesn't drain into the aux system.

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