Quote Originally Posted by N2OGTO View Post
That's a good point mike, but I let the boat run bc it literally will play for hours. On Tuesday night when the alternator let go, the boat ran the entire time the stereo played probably about 6 hours and it pulled the batteries down and the 70 amps max that that thing could put out was not enough to keep them charged. before, the voltage while running and playing the boat would start out at about 14 Volts, then once played for a while. The voltage would start to come down And hang around 12 so I'd turn the stereo down and let the alternator charge them back up. Now that thing is a monster. It can hold a solid 13.5 volts on my digital voltage gauge and it never fell off last night.
Bro honestly letting the boat idle isnt going to help much, an alternator is really barley putting any power out at idle.
It needs to be at 2K RPM to reach max output.

SO if you try the same thing with your new alternator their is a good chance you will toast it in time as well.

NOt trying to rag bro honest. I like your upgrade, and its a value added one but if you tie up and crank that long, you need to look into golf cart battery upgrades.

Mike are rated at 20amp for 570 minutes each
70amps for 180 minutes each <if i recall>

I have ran mine all day with the tunes about 1/2 and never an issue but i do have to shore charge them because my boat cant get them to max that fast