I just purchased a 1991 e31 850i with 9200 original miles. It has 2 batteries in trunk. How do I hook i hook up a battery maintainer? One on each battery or one only on one of the batteries, or is there a terminal under the hood?
Mr Proops, there should be a terminal under the hood, you can connect it there. Also, the 2 batteries are connected together, you can therefore connect the charger to either battery and it will be connected to both batteries. Please let me know if you have any questions. Thank you.