![]() The brown and purple wire I assume is the switched negative return which appears to go back to the control module in the boot, and even there its not being switched to ground to activate the charge relay. The red wire seems to have a permanent positive supply on it which will light a test lamp. There are two switching wires, one red and the other Brown and Purple. Another battery was substituted to no avail.Īfter further digging it appears that the auxiliary battery charge relay on the bulkhead under the wipers is not switching. ![]() I checked the alternator output at 14.2 volts and this was reaching the main battery in the boot, this voltage can also be displayed on the instrument cluster. After refitting it normal service was resumed and the car started and stopped fine! If the car was left to run the auxiliary battery eventually ran back down to 12.7 volts at which point the engine would not switch off and the whole palava started again. I then charged the auxiliary battery under the bonnet which was down to 12.7 volts. We finally got the car stopped by pulling a grey relay under the bonnet, nothing else would work! after reinserting the relay he car would then not start because the ignition key could not be turned. Various fault messages were scrolling across the instrument cluster but the one that caught my eye was "Battery Protection, Convenience functions disabled". When reinserting the key all the correct clicks and Whirring sounds were made but you couldn't turn the key. He had arrived home from work and removed the ignition key but the car carried on running. Several technologies have been used to achieve control of DC in this manner: silicon rectifier packages, Schottky rectifier packages, MOSFET rectifier packages, and conventional mechanical relays.A friend called to my house the other evening with his 2004 W211 E320CDI. Isolators are also used in vehicles with large, high-power car stereos and off road vehicles to accommodate high current loads such as a recovery winch. A battery isolator helps to ensure that the starting battery has sufficient power to start the engine and recharge the batteries if, for example, loads on the auxiliary battery (e.g., refrigerator or navigation lights) cause it to be drained, or if an auxiliary battery fails. Uses īattery isolators are commonly used on recreational vehicles, boats, utility vehicles, airplanes, and large trucks where one battery is dedicated to starting and running the engine and another battery or batteries run accessory loads (e.g., winches, radar, instruments, etc.). The disadvantage to an isolator is added cost and complexity, and if a diode-type isolator is used (which is very common) there is additional voltage drop in the circuit between the charging source and the batteries. This is beneficial because a weak or dead battery will drain the charge from a strong battery if both are connected directly together. The primary benefit of such an arrangement is the ability to simultaneously charge more than one battery from a single power source (e.g., an alternator) without connecting the battery terminals together in parallel. JSTOR ( June 2007) ( Learn how and when to remove this template message)Ī battery isolator is an electrical device that divides direct current (DC) into multiple branches and only allows current in one direction in each branch.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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