I am throwing 6 Hella 500's on the front and some small Hella's on the rear.. I know if I run all these, it's going to drag on the alternator, but I won't run them very often.. and Maybe never..
Will the factory Alternator hold up to that, or is there a high power alternator? Like Mean Green or one of those people for the 4.6l P-38 engine??

 

I run 2 brush guard lights, a 250 Watt amp, and a 400 Watt amp off of my factory alt and it still sits between 14.1 and 14.5 while running. I'd say you're gonna be perfectly fine as is. Just upgrade your battery to a dual purpose deal. Most marine batteries are dual purpose.

 

More to the point will your battery and overall wiring system stand the extra power requirements. Lights are a major power soak if they aren't LED's. The alternator charges the battery and tops it up and everything operates from the battery therefore the alternator merely ensures the battery is as fully charged as possible. More draw requires more storage or in other words a larger capacity battery. You can buy larger capacity batteries and alternators bearing in mind the more power you draw the heavier the fuel consumption when drawing down the additional power. The analogy is a portable generator, when there's no load power drawdown the engine ticks over comfortably when it's on max power drawdown the engine works far harder using more fuel and indeed sounds like it is working hard.

 

mean green offers the highest output.
3 versions
I run the 200

 

Mean green does have sweet stuff, but you definitely don't need it for 6 hella 500s. I was running 6 4000s at 100 watts each without issue.

 

Find an alternator from a Range Rover of or near the same year.
It will have 50 more amps.

It will bolt in too.

 

MAN!!!
Good call! You beat me to it that's exactly what I was going to recommend

 

are the rr's 180 or?

 

Dusty I would have to look but I think the D2 is 120 -130 and the RR is 150.

But you know me I drink a lot and maybe wrong.

 

gotcha....tells you how much I do too, because I thought d2 was 150..