big 3 on factory alternator?

I have a 2004 mustang 3.8 with a factory alternator 130amp? (i think) and id like to upgrade the big 3 (alternator + to battery +, alternator housing ground to battery -, battery - to chassis body since its convertible) and im wondering if its a good idea to do before I get a HO alternator? i have the option to do it now but will it damage the alternator? do you have a good suggestion for a HO alternator for a 2004 mustang 3.8l? how many amps 250? thanks!

It's always a good idea, IMO.Support the12volt.com

You can't draw more than the alternator can supply. And the alternator is supposed to supply the loads - not the wiring loses. (Reducing the losses should not damage the alternator.) For warranty reasons, I suggest adding the extra grounds and cables rather than replacing. How would a Kinetic help? AGM I presume. For extra batteries, AGMs may be good or required (ie, if needed to be a sealed type), but for general cranking etc standard cranking flooded batteries are usually best. For big audio, winches & big reserve loads, a 2nd battery is usually best (with auto-isolator). An extra battery will not "add an extra load" despite what many say. Or rather, in practice, it reduces the load on the alternator and can extend the life of both batteries (provided suitable non-use isolation is provided) - ie, load sharing - expecially if cranking).

would a Stinger 200 AMP Relay and Isolator be nessesary? ( http://stingerelectronics.com/productDetails.aspx?Productid=90&CategoryID=2). yes AGM

An isolator is necessary. Permanent connection reduces the life of the batteries and can leave you stranded... I'm not keen on voltage controlled isolators except when required (eg, stator systems). For systems with charge lamps, isolation via any charge-lamp controlled relay is fine.    The relay size depends on what you want (eg, if cranking, up to full cranking current; for audio, the full audio load plus recharge current etc).     Don't forget protection (fuses or breakers) at both battery ends.

ive got a regular battery under the hook, 0G going to the rear to a 40 amp hour (vision x XPC-400) batterys (+), 0G off the battery (+) to dual 4G distro block to my amps. battery (-) and amps ground to chassis. and needing the isolator? correct with a standard 130A alternator, can you suggest where to get a HO for a mustang 3.8? hard to find and dont know reputable companys. thanks for the help!

Do you need an HO? No idea where, but I recommend a specially built HO - not a rewired standard alternator (unless you don't need the HO, then a rewired st'd "HO" alternator is fine lol). You have fuses at each end of the battery interconnect? Else good physical security? (Or are the battery terminals or cable the fusible link?)    An isolator should be used to prolong battery life.