The 928 cabin is a superb soundstage!

I just hope that I don't have any electrical issues when I fire her up.

BTW
installing the new system now.
Went with JL speakers (XR653-cs), the new 600 watt (XD600/6)JL amp, Pioneer 7 inch (AVH-P5200BT) with Nav Module and a 800 watt sub (TS-SW251)

Pics and up dates to come but on the other thread

Sheesh, the stock electrical system can barely power the car. I hope your new alt can handle the bill.

I was considering mounting a second alternator with a ground isolator to power my added electronics. Possibly mounting it where the old smog pump used to be?

I could also put it on a switch and go to that unit when my other died and otherwise would have left me stranded? Just an idea..i have the second alternator(from a subaru) and fuse box..just need the isolator and wiring.

Interesting. Never seen this done on any car. Please post pics of your project.

It should, its a 200-amp Alternator

The 200-amp Alternator Kit Includes:

NEW custom 200 amp SAE-rated alternator
Custom welded Porsche® 928 mounting adapter bracket
Wiring Harness Adapter
Complete Installation Instructions

I'd go through the whole system and change out ground cables, scrub terminals, and have a look in the pod for that lead that provides the exciter voltage for the alt. IPD USA has a cool expression for this: stage zero. Get the car in the best stock condition that you can before you start upgrading components.

second alternator
 

I have a book on automotive upgrade projects, tells how to do this for installing upgraded stereos. My car had a 5000$ stereo in it when purchased (which i immediately removed,( 3 AMPS, CD CHANGER, ALL ASSOCIATED WIRING ETC.) The batt gauge would barely move off 12 volts at 3000 rpm. I am going to install an onboard computer(PC) to run my stereo, gps, and maybe some relays for stuff in the car, as well as a security system...anyhow i want to put all this on a seperate circuit and power suppy..that means 2 batteries..and lots of money. Anyhow that will be sometime next year so no pics any time soon...The books are the "Auto projects for the evil genius" series and "Car PC hacks" by Damien Stolarz.FYI. Yeah i have to finish my fuel injection system re-engineering project first.

I just never seen a 2 Alternator car set up before. I guess I can Google it.

Have a look at the Jacobs Electronics AccuVolt system. You give it dirty, unstable voltage, it puts out clean, stable 16 volts (selectable) without fail. Plug up your entire stereo system to it, loads of clean power.

Accuvolt

JACOBS ELECTRONICS ACCUVOLT FR375W ACCU VOLT RARE! - eBay (item 220619456053 end time Jul-09-10 09:52:50 PDT)

I'd love to install one of these in mine. The Jacobs UltraCoil is working like a champ so far.

Where I picked up my stereo at (certified radio) in Edmonton, one of their competition cars has 2 alternators

An extra alt will be yet more load on the engine. Maybe your car has loads of power. I'm not sure my 16 valver would do well with another alt.

That Jacobs unit would give plenty of juice and then some without loading the engine.

extra alternator
 

I think the overall cost would be less for a second alternator, given a rebuilt ac delco unit costs <50$. The associated hardware should cost around 50$ more and then the labor of wiring...I do the work myself of course. My car is an 87 32 valve 5 speed with a few upgrades(autothority chips, xpipe,2.5" exhaust, etc.) In any event an extra alternator here is replacing my smog pump location so I doubt there will be any excessive drain(an alternator should never drain more than 8 hp...). There are many routes to take on this, a 200 amp alternator would work as well but i have found that these are very expensive(for a quality one). The best place to look here for an upgraded alternator would be the local alternator rebuild shop. They can generally supply you with a quality 200 amp unit at less cost than any outright purchase. Swapping to an AC delco unit would prove benificial for future repairs etc.