Do I HAVE to change my alternator for a multiply battery setup?

Question

I have a 2005 Centurion and am adding a fairly large stereo to it.

My question is, do I have to change my stock alternator or will it work with the setup I have? I'm running 1 battery for the engine and 3 seperate batteries isolated by a battery isolator from Stinger. All batteries are connected in parallel to maintain the 12V system. My main concern is will I damage the charging system if I don't change the alternator out for a larger 200A one.

Any help is greatly appriciated!

Answer 1

alternator is o.k,i would get a split charging system to save the engine battery draining into the other battery's when you turn the isolator switch back on,

Answer 2

no

Answer 3

You don't have to change it, but you could go to a wrecking yard and see if they have a similar Alternator but larger output that will fit, usually you can get them about $25.00 and "New condition" if your lucky

Answer 4

Stock alternator should be OK.  If you want to play it safe, check with your local dealer or marina.

Answer 5

hubby says to get bigger alternator or buy optima marine batteries because the bigger radio will draw more juice