Myriad of electrical problems? - Pontiac G6 Forum
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post #1 of 3 (permalink) Old 02-05-2019, 03:18 PM Thread Starter
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Myriad of electrical problems?

Sorry for creating a new thread, but after searching through many posts here, I really didn't find one specific to my issue. Because it seems to be many issues. Bare with me...
Last summer I purchased a 2005 G6 GT. Great deal [always clue #1...]. Seemed to have an issue with the security system, as when you unlocked it via key, the horn would give you the short blasts until you put the key in the ignition. Also, at low speeds the doors would rapidly unlock and lock once or twice. Annoying, but I could deal. Also, not the original key and the remote is incorrect for this car. Otherwise, all was good. Had some recall work performed at the dealer. One of these included doing something to the BCM. I point this out, because shortly thereafter the battery died. Had it jumped, ran fine. Now I should add I do not drive it anywhere near every day. It typically will sit for 2 or 3 days between starts. No problems starting though for the first 3 months or so. But it started dying each time I would let it sit. Not completely dead, but to where the accessories would work but it would not start. Battery tested fine, but O'Reilly's said the alternator was bad. Replaced it. Dead as a doornail a few days later. I decided to start disconnecting the battery between uses. This worked for several weeks. Then even that wouldn't get it started. I assume there is a parasitic drain somewhere, and I did buy a meter to test it and I guess that is what I am asking. Does it sound like a drain or with the security system issue, am I wasting my time? I bought one of those portable 5-in-1 jump starters [those things are amazing, I bought one for each of my daughters] and it starts up each time I use it. It is winter, and I'm in the northern US, so I'm sure that isn't helping but the problem started back in late September. Also, several seconds after it has started, a loud clicking noise comes from behind the glove compartment that stops if I change the method of air intake. So, any thoughts from those of you far more knowledgeable than I? I can handle some basic stuff, but if I'm going to have to start pulling out wiring schematics and rewiring this thing, I'm out for that. After reading other threads, I have seen issues with a parasitic drain, security systems and BCM issues. I feel like I have all of those at once, not just one and that is why I started a new thread. Hopefully this ends up being something I can handle and I appreciate any insights.
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post #2 of 3 (permalink) Old 02-05-2019, 06:02 PM
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Join Date: Jul 2018
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Take it one thing at a time in logical order.
First you need to assess the battery and charging system. Get yourself a plug-in voltmeter so you can see if it's charging, like this:
You should get somewhere in the 13-14.5V range while driving. If not, you have a charging problem.

Now for the battery:

Originally Posted by Rufust7 View Post
I decided to start disconnecting the battery between uses. This worked for several weeks. Then even that wouldn't get it started. I assume there is a parasitic drain somewhere, and I did buy a meter to test it and I guess that is what I am asking. Does it sound like a drain ...
That logic doesn't work. If you disconnect the battery, it can't discharge. Doesn't matter if there is a parsitic drain in the car. So if the fully charged battery can't hold a charge for a few days, while disconnected, you likely have a bad battery.

After you have all that sorted out, you can start looking for parasitic drains.
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post #3 of 3 (permalink) Old 04-05-2019, 09:24 AM
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Take cds out of the stereo and feed them back in
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