Thread: Weird electrical issues

So, this thread is my last ditch effort at trying to get some help with my electrical issues before I lose it and trade the car in. Every mechanic I've taken the car to ends up not finding anything wrong.

So, here's the issue. A lot of electrical items on my car have started malfunctioning or plain stopped working. For instance, my driver side and passenger side rear door locks will not lock/unlock with the switches or by remote. The climate control lights have all went out. Also, my battery does not seem to be getting charged. I get a 'charging system failure' from time to time while I'm driving. So, in the morning, when I'm about to leave for work, sometimes my battery will be completely drained. I just put this battery in 2 months ago and it tested fine recently. I charge the battery with a trickle charger and it starts up most of the time. I haven't taken my alternator off to get it tested. Also, my serpentine belt is a little chipped. I know, I have to get that replaced too.

My thoughts are I have a bad BCM. Before I go to a junk yard and pull a BCM and get it reprogrammed for my car, is there anything else I can check besides doing a parasitic draw test? Is there anyone in Milwaukee who can drop me the name of a decent mechanic who knows their way around these cars? I don't mind not having my car for a week as I use the bus to get to and from work.

You guys are my last shot at this.

I was searching through ls1tech and I found some people had issues with the battery current sensor on the GXP models. Could this be a likely cause? I'd rather not throw parts at the problem, but right now that seems to be all I can do.

I had batteries plus run a tester on the battery in November and they said the alternator is fine, but that battery was supposedly bad. That battery lasted a good 2 months before it starting showing the same symptoms. I haven't taken the alternator off yet to get it tested because, well, I'm not sure how to with the LS4. I _think_ the tensioner is somewhere by the passenger wheel.

The DIC usually brings back 14V when I'm driving. The DIC get that number from the BCM which gets it from the battery current sensor right?

I think you have a floating ground going on. I would check every single ground connection.

I had similar issues in my 07... it turned out to be a power ground to the battery.. I replaced it and added another ground to chassis and one from battery negative to engine chassis... haven't had an issue since.

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Originally Posted by Robxstone

I had similar issues in my 07... it turned out to be a power ground to the battery.. I replaced it and added another ground to chassis and one from battery negative to engine chassis... haven't had an issue since.

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Sorry but what do you mean when you say "power ground to the battery?" Should I just replace all of the grounds under the hood? Are there any other important grounds that I should check besides battery to chassis?

Im sorry lol.. I reread what I wrote... and it didnt make sense.. basically what I did was purchase 2 ground wires from autozone.. they were about 8 gauge with 2 metal rings on each end of the cables... I also purchased a new battery terminal for ground that allows for multiple attachments... ill try to find the link to them in a moment here to show ya... I still used the factory ground wires as well... I cut the factory groubd battery terminal and installed the new one with 4 wires coming off of it... 2 factory wires and the 2 new wires (one going to a engine chassis bolt and the other going to a bolt on the engine near the dog bone... this gave me better starting, smoother shifts, and brighter headlights... my cars dic kept saying system charge failure and once in a while my speedometee and gas gauge would cut out... and my battery voltage meter wouldnt read correctly... it was definitely poor ground because factory ground on the chassic was corroded to ****... so I wire brushed it and added the new grounds..

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http://m.delcity.net/images/photos/m_309605_primary.jpg

http://m.delcity.net/images/photos/m_309605_primary.jpg


The bottom picture.. I purchased 2 of them.. they were ch eap and used them for both the positive and negative post on the battery.. so much better than stock... plus you can add wires to them down the road.. I used the bolt that tightens the terminal for the new ground cables as seen above.. and the factory wires go into the holes.


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Opps this is supposed to be the second pic
http://i00.i.aliimg.com/wsphoto/v0/9...pg_250x250.jpg. stupid phone lol.. hopefully this helps ya as it did on mine..

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