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Message: <blockquote data-quote="jarance" data-source="post: 88689" data-attributes="member: 21">To check the alternator, just go any battery shop. They have an ammeter which is connected in series with the battery terminals. When the car is running, the amp output from the alternator should comes to about the rating of the alternator. You can also use an DC clamp on ammeter (range about 200 amp) to do thee job. The clamp on ammeter do not required one of the wire to be disconnected from the battery terminals.For bad earthing, there are many ways to check.1. check for worn out or rusty terminals. Rust are bad conductor.2. Use a heavy duty cable and clamp it at the negative terminal of the battery. You can use the battery jumper wire (rated to about 400 amp). Clamp the other part to the front of the car body. If the problem ceased after you have done it, then your problem is due to bad contact. Some of the accessories shop do "extra" earthing. Some people claimed that their Hi-Fi sound better after the earthing is done..3. Sometimes, the problem could be also caused by bad insulation of some of the wire hardness etc. This problem is very hard to detect. Only you can know as you are driving the car constantly.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" />k:</blockquote>