Was it a new, rebuilt or reman'ed alternator? What brand was it?
How about the battery? What is it's voltage showing?
How about the battery? What is it's voltage showing?
New alternator--AC/DELCOWas it a new, rebuilt or reman'ed alternator? What brand was it?
How about the battery? What is it's voltage showing?
Terminals real clean and making good contact. "No" battery not charging message at all & no codes.Are the battery terminals making good contact? Are the terminals free of corrosion?
Do you ever get a "Battery Not Charging" message?
Engine off voltage on cold start is 11.8 and it starts ok.What is the static (engine off) battery voltage?
It`s all stock-- no aftermarket stuff. Had battery checked Friday at my mechanics place and it checked ok.Did you install any aftermarket equipment such as a radio?
It could be a bad battery, but maybe something is causing a very high load on the battery and when you press the brakes, the car shuts off.
What does that indicate then--battery or alternator?That may be your problem.
Already had it load tested last friday--ok.The charging voltage is fine. Have the battery load tested.
You`re welcome.Thanks for posting that fix. Was the butt connector a previous repair attempt in the car's history? It doesn't sound like it's supposed to be there.
Ever since the fix the GM mechanics did,posted in this thread earlier, it`s been running great---handles all heaviest electrical loads with"out" flinching at all.Hi.
Glad I saw this. Are there any updates? Is it still running OK?
I am having a similar problem with my '91 DeVille with the 4.9L. It started about 8 weeks ago. The car always starts fine, etc, but under an "electrical load", when I stop at a red light/stop sign, it started to bog down and splutter like it wants to stall. It starts when just the headlights are on (rough running at times), but when you also have on the HVAC fan on high, it really stumbles and splutters and seems like it may stall. No engine warning lights are on. The alternator was tested at Advance a few weeks ago and he said it was fine, but it was just a kid, so he may not have known what he was talking about, but I would think if it was that bad and was the alternator the charge/battery light would be on?
I took to one of my mechanics to check my engine coolant leak (which they repaired), but said they could not duplicate the problem... naturally. lol. Obviously they didn't let it fully warm up because that is when it does it. I just think they didnt know what it was, so they said it didn't do it, because when I went home after getting it that evening, it did it again to me.
Also my MPG is going way down... I was averaging 19.2 back in September, now I am down to an average of 17.2 and falling. Also, I have not had to let the car set and warm up in the mornings, as it has not really been cold. I am glad I have had my new car to drive until I could get this one checked and have saved a lot of gas, but like driving this car on the freeway, so want to get it fixed. I also want to sell it to get another Cadillac, preferably a Fleetwood.
I will check around the battery cables tomorrow for anything that may look awry. Thanks!
Also remember they added "an extra ground wire from engine to body".Thanks! Great news! I will definitely check out around the cables, etc tomorrow. Keeping my fingers crossed.