On mine they replace the ignition switch, the battery relay and the body control module and none of it fixed the problem. I just learned to use the above procedure when it happens. Sometimes it take a while for it to work. Almost like something is warming in a circuit.

Richard

Im pretty sure it is not starter or ignition problem as it starts no problem with a boost.I just took it for a run after a boost and sat in the car after everything shut off, was getting out and heard the speakers hissing, I pulled the fuse to the amplifier and hiss went away so hopefully in the morning it will start and this was what was draining my battery.I have also discovered a slow leak in one of my tires would this make the ELC run all night.
I still havent ruled out the battery being the problem as Canadian Tire tested it for me and they have told me once before in another car that my battery was good and it was not.Thanks for all the input, I will reply tomorrow.

jdq, is that the original battery in your '00 Bonneville? If so, I'd have to believe that the battery needs to be replaced due to its age. Do you have a known good battery from another car that you could try as a temporary? (You'll have to excuse my ignorance if the Bonneville battery has an unusual cable connector and another battery can't be cabled up. I've seen the battery under the rear seat in my 01 but don't recall if there'* anything different about it other than having a vent tube.)
It just seems strange that all was okay until the temperature took a nosedive; I've always considered that a sign of a failing battery.
I think I'd try another battery before doing much else. Sounds like you'd know if it was the battery after an hour of shutting off the car.

Rob

No the ELC is not connected to the tires

Thanks, I agree and do suspect battery even though I had it tested , but I dont have a spare and the cables are different.I will see tomorrow if it starts as I just checked now 3 hrs later and car is good (maybe amp was draining and pulling fuse did trick)If not I will probably go and spend the $200 for A new battery.Up here in canada you cant buy these batteries at normal auto parts places, I have a AC DELCO up the street.

I'm no battery person but I wonder if it would be better to unhook a battery cable for the night then reconnect it when you are ready to start it. That way you'll be able to tell if it starts that you have something draining it. If it don't then I would say it'* bad.

I disconnected it last night and it was fine in the morn.

John... take a drive to see Tracy.. She'* a little south and probably can tell you where to get the battery for a good price. (Although I think she had to order hers)

Well today there is no issue with the car I think pulling the fuse to the amp did the trick (amp stayed on and drained battery).Now without a radio, how can I sort out the amp draing battery.Do I need a new radio, amp or do I chase wires.
Bill if I do end up getting a battery that might not be a bad idea, Ill have to ask her where and how much.
Now that my car is running Ill start a thread in electrical for my amp short.Thanks for all the help.

Was your current draw .020 amps ( 20 ma)? If so, that falls within the parameters of the maximum allowed, which I believe is 25-30ma. If that is your draw, and the battery is still going dead it would appear to point to a dying battery.