Every once in a while when i try to start my car .. when i turn the key i get a big clunk and everything goes dead in the car.. interiors lights and everything are dead.. then i wait a few minutes or if i just touch the battery or shake the car the lights come back on.. then i turn the key and it starts right up.. i changed my alternator a few months ago( had it tested and was advised bad alternator and battery was ok) need help.. not sure if its a short or something.. happens about once or twice a month.. the interior lights kinda pulse when driving a little..
Several things. Take the car to Autozone or Oreillys for a free scan. Before you go, check the starter and starter cables under the car. Have them check starter draw. Have them check the battery and alternator.
It sounds like the alternator is not quite filtering out the electric pulses it creates when working. The starter can ground out but usually not after you are moving.
If the gauges do not indicate anything, do a wiggle test to see if you can find the short.
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