[avlind]

Hi, I don't know if you resolved this, but if it was not the starter, and "the boy's" were "playing" with your system, it sounds like it could possibly be drawing more power and your alternator might not be able to properly keep up with the demand when you have a "Load" on the system. You may want to see if when all accessory items are off (radio, wipers, etc) if it runs better.

I am not sure if you can just get a larger alternator, but you may want to look into a solar trickle charger for your cig lighter when you are between road trips.

However, this would not explain the noise you are mentioning.

Good Luck,
Aileen