![]() ![]() I've tried to illustrate this in the chicken scratch drawing attached to the post - the upper battery being the main battery, the lower battery the auxiliary, the left relay being the heavy-duty isolator, the left switch being a manual override, the right switch representing the ignition-controlled circuits that also provide power to other circuit devices, and the heavily scribbled line showing the effect of closing the manual override switch energizing the trigger post of the heavy-duty isolator, and also energizing the line connecting the isolator to one of the secondary posts of the smaller relay, but not continuing on to the 'other circuits' connected to the ignition-switched circuit. This would allow me to wire a second manual switch in parallel to the smaller relay, which when closed would not energize the other devices on the 12v vehicle running circuit. What I thought would solve this problem was to use a second, smaller relay which would use the 12v vehicle running line as a trigger, and would have the secondary side connecting the main battery to the 12v trigger post of the isolator. Then I realized that doing so would also energize the 12v line that's normally on when the vehicle is running, possibly providing power to other devices on the same circuit. At first I thought I could simply wire a switch in parallel to the existing trigger, that would connect the main battery to the 12v trigger post when the switch is closed. The 500 amp isolator that I'm looking at is simply a large relay - the trigger posts are connected to ground and to a 12v signal that's hot when the vehicle is running, and the secondary side of the relay connects the positive terminals of the two batteries. Blue Sea Systems Starting Isolation (SI) Dual Sensing Automatic Charging Relay. Many smaller battery isolators have such a reset switch or terminal built-in, but larger 500 amp isolators don't appear to have this function. Visit West Marine for expert DIY tips on installing a second battery for. I would also, however, like to be able to override the behavior of the isolator with a manual switch (e.g., to connect the batteries when necessary to use the auxiliary battery to assist in starting). So far so good, there are plenty of battery isolators to choose from. We recommend using 8 AWG wire as the optimum size for a minimum of 20 feet and up to 35 feet and then fused at each battery end with 50A or 60A circuit protection. This will either turn the relay ON or OFF depending if 12 volts are being run though the wire or not. These connection points are used to hook up each positive battery terminal to the relay. So I'd like to add a second battery to my car and have it isolated from the main battery when the alternator is not running. The first connections are the actual posts, depending on the relay there will be two or more of these. ![]()
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