Cadillac STS-V Series Forum Discussion, Dreaded SERVICE CHARGE SYS in DIC in Cadillac V-Series Forums; output voltage should be at least low 14s--dont underdsatnd why its "climbing" its either over 14 or not--unless your battery ...
output voltage should be at least low 14s--dont underdsatnd why its "climbing" its either over 14 or not--unless your battery is low--the battery should be 12volts and its parallel to the alterntor which should be 14 and charging the battery as you drive--if the battery is lower than 12, it might be using up the alternator output and battery is in charge mode--let it sit in driveway for an hour or so running and see what happens--dont leave ac on--too much load still sounds like you may have a ground issue
Thanks everyone for the input and advice on this thread. Wake was right, the remanufactured alternator just did not cooperate with the car. I took it in on Friday, they replaced it with an AC Delco alternator and it's been running like a champ ever since. I thought I could cut some corners and get a remanufactured alternator and have a friend put it in for for half of what Cadillac would charge me... Well here's a list of my expenses. $125 from Cadillac to diagnose, $183 for Pep Boys alternator, $150 for friend to put it in, problem still existed so I bought a new battery $190, problem still existed so I took it back to Cadillac and had them install the AC Delco alternator $800. I can get the money back on the Pep Boys alternator, and perhaps the battery, but I wasted $125 having it diagnosed twice, and $150 for my friend to install it. Moral of the story, stick with the AC Delco alternator on these cars.
I used to drive BMW's and I learned the hard way as well to stick to OEM parts. Long story short, check engine light, scanner says camshaft position sensor, replaced with a reputible aftermarket replacement, reset light, comes back on. Failed emission test due to check engine light, off to dealer, they replaced the Camshaft position sensor with a BMW one and that was the culprit. I am now a firm believer that anything electrical related, go with OEM. Nowadays unless it's brake pads, suspension, or exhaust I stick with OEM. Fortunately OEM parts can be found much more reasonably priced online. The only downtime is waiting for them.