Charging System! *HELP*

[Maeda]

So my car was running goofy, it'd start at 12v then dip down to 7, and just before it died it would spike back to 12 and repeat the process.

I tried driving home last night and I saw it falling, and expected it to jump back up. Too bad it didn't. 50 miles towed back home.

I tested the alternator this morning after a jump, and it was putting out 13v at the terminals, except at the battery the voltage was falling!

I bought a new battery. SAME EXACT THING!

WHAT IS GOING ON HERE??? HELP ME!

(accidentally posted in 240 technical first)

[Maeda]

I was told it might be the voltage regulator... does this sound like the problem?

EDIT: Ok I just changed the alternator.

NEW BatteryNEWish Alternator

Car runs perfectly until I turn it off. Then the voltage drops to 10, and it doesnt have enough juice to start back up again...

I'm getting parasitic drain here... -_-BUT maybe not because it doesnt fall down to zero?

[NISTECH]

check your connections on your battery terminals and at the other ends of the cables. perhaps the positive lead on the starter is loose? If it drops immediately like that I am thinking you have a connection problem somewhere. make sure your battery terminals are securely fastened to the battery as well.

[Maeda]

Thanks.

I think it was the 100A fusable-link that was melted into my fuse box...

Any ideas on how this didn't blow the fuse?

EDIT: Cars dead this morning. Something must be drawing power from it when it's off... i'm gonna try pulling fuses again.

[Hank]

I have seen problem with the alarm system may have caused the drain and where is this 100Amp fusable link supporting, the ignition system I supposed? Did the starter and solenoid declutched after start up? Standard charging volt should be around 13.5 to 14.0 volts and what did the drive belt sound like at idle & rev @2K. If they squill then need adjustment when engine is cold. Good luck!