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Message: <blockquote data-quote="jarance" data-source="post: 213807" data-attributes="member: 21">Nice analogy but a bit flaw. yes the tank (voltage stabiliser) help to give a constant flow. but the design of the main water supply of bmw is already designed to cater for all utillities. i.e. wash dish, take shower, wash car etc. and at the same time fill the tank (which by the way is the battery). If the alternator supply is not enough, then the battery would remain uncharged. So in the case of where you install a water tank (VS), it will never be always full due to the lack of water supply if the piping is partially blocked. Hence, constant flow is never quite achieved. The problem with most older car is due to scaling inside the piping. This scaling restict the flow of water. In the case of electricty, older cars tends to have rust or oxidation form on the earth and positive terminals. This cause the flow of current to be restricted. As most of the guys here fixed the VS with new earth wire, you are actually infact putting new piping to allow the flow. VS are a series of capacitors wired in parallel to smoothen the effect of spikes that is generated by the alternator. It help sometimes but a more cost effective ways to restore the full power is to clean the oxididised or rust area of the earth terminal. Apply with copper grease on the cleaned area to prevent oxidation.</blockquote>