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Battery Quick Disconnect for 2005 C6. Which One?

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Old Jan 29, 2021 | 02:54 PM
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Default Battery Quick Disconnect for 2005 C6. Which One?

I have a 2005 C6 with the dread battery drain issue and for years have put a battery tender on it. A CTEK MUS 4.3.

Even with a tender on it , when the car is not driven for long extended periods of time the battery will be eaten by the dreaded battery drain.

I'm looking to put a battery quick dis-connect to try and mitigate this long term battery drain.

I've read on prior post that its essential to keep the battery connected for window indexing, BCM,ECM blah blah blah, at this point I feel disconnecting the battery and dealing with the hassles are better than replacing batteries every year.

its the cost of doing business.

So my question is what is a good disconnect for a top post battery that will allow me to use the CTEK Connect Eylet M6 https://www.ctek.com/uk/products/car/connect-eyelet-m6
Any info is greatly appreciated!!
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Old Jan 30, 2021 | 12:26 PM
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Do some searching on the C6 Forum. If I recall correctly, Dano523 posted that GM has a fix for this problem.
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Old Jan 31, 2021 | 04:58 AM
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Yep, the original firmware had problem with the modules not going into sleep mode, and GM issued updated firmware TSB reflashes for the 2005 cars.
Note, had a problem with the cd radio firmware as well (static) and even had a firmware update for the radio's too. Some of the update firmware's were corrected on the laster 2005 runs, will some of them where not corrected for another year instead.

If someone around you has TIS2000, it will have the latest firmware for both the BCM and the RCDLR that you want to flash into the these modules.
Also, since you already have the car hooked to TIS200, not a bad idea to just go through all the modules to see if there is updated firmware for them as well. Hence in TIS200, it will be only searching for the firmware for your Vin number, and easy to compare what is flashed in, verses the list of firmware by dates in the list that can be flashed instead.


As for disconnect, instead of solving the problem, will have to remember to re-index the windows and reset the time on the radio (if stock) when you power the car back up each time.

Lastly, the CTEK MUS 4.3 put out about 4.3 amp charge, so if its not keeping up with the parabolic draw, something is very wrong and its more than just a module or two not going into sleep mode the problem at hand.

Last edited by Dano523; Jan 31, 2021 at 05:03 AM.
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Old Jan 31, 2021 | 11:50 AM
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Originally Posted by Dano523
As for disconnect, instead of solving the problem, will have to remember to re-index the windows and reset the time on the radio (if stock) when you power the car back up each time.
Doesn't the radio clock reset itself from a satellite signal?

Last edited by John Harry; Jan 31, 2021 at 11:52 AM.
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Old Jan 31, 2021 | 12:50 PM
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Our 05 c6 doesn’t. The clock resets every time I do a parasitic draw test, and I’ve done a ton of those since we bought our 05 November 1st.
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Old Jan 31, 2021 | 05:01 PM
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Originally Posted by Dano523
Yep, the original firmware had problem with the modules not going into sleep mode, and GM issued updated firmware TSB reflashes for the 2005 cars.
Note, had a problem with the cd radio firmware as well (static) and even had a firmware update for the radio's too. Some of the update firmware's were corrected on the laster 2005 runs, will some of them where not corrected for another year instead.

If someone around you has TIS2000, it will have the latest firmware for both the BCM and the RCDLR that you want to flash into the these modules.
Also, since you already have the car hooked to TIS200, not a bad idea to just go through all the modules to see if there is updated firmware for them as well. Hence in TIS200, it will be only searching for the firmware for your Vin number, and easy to compare what is flashed in, verses the list of firmware by dates in the list that can be flashed instead.


As for disconnect, instead of solving the problem, will have to remember to re-index the windows and reset the time on the radio (if stock) when you power the car back up each time.

Lastly, the CTEK MUS 4.3 put out about 4.3 amp charge, so if its not keeping up with the parabolic draw, something is very wrong and its more than just a module or two not going into sleep mode the problem at hand.
Thank You for the detailed info. Is there a site that I can go to that shows TSB for my car? I don’t know anybody that has a TIS200 other than a stealership?
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Old Feb 1, 2021 | 01:01 AM
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Originally Posted by John Harry
Doesn't the radio clock reset itself from a satellite signal?
The nav radios, yes, once you have updated the firmware now, so it grabbing the correct signal to get and display it.

The non-nav, cd only radios, no, and they were the first ones to get the upgraded firmware for the static problems on the first 2005 units about mid year 2005.
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Old Feb 1, 2021 | 01:46 PM
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Ah-ha. Thanks for the clarification, Dano.
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Old Feb 12, 2021 | 11:58 AM
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My early 2005 has the NAV system installed and I have had the battery replaced twice in 6 years.. No problem with first battery replacement, but 2nd battery (from AAA) was installed and the clock never returned. And no way to access it for resetting it... there are several tech notes about this issue, if your clock display "disappears. The clock "magically" reappeared after about 9 months! But as far as battery "going dead" from sitting in the garage, Mine has sat in the garage for 10 months, due to Covid restrictions about going anywhere. Since March of 2020 I have only driven the car about 4 times, and less than 200 miles! It starts up immediately, So, obviously there is a problem with "sleep mode " not happening in your car. BTW my Corvette has 195,000 miles...certainly more than most. In summary, dont be surprised if your clock stops working if youn disconnect the battery.
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Old Feb 13, 2021 | 12:44 AM
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I use the **** quick disconnect. You could easily attach the CTEK eyelet onto the clamp bolt/nut.

Window index is easy. Roll down the windows a little before disconnecting. When you reconnect it takes like 10 seconds to index it. You literally just hold the window switch in the up position for a few seconds.

Clock issue seems to be resolved. I never updated my firmware but the clock nav gps picks up the signal everytime time now.
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Last edited by ttx350z; Feb 13, 2021 at 12:47 AM.
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Old Feb 16, 2021 | 10:30 AM
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Originally Posted by ttx350z
I use the **** quick disconnect. You could easily attach the CTEK eyelet onto the clamp bolt/nut.

Window index is easy. Roll down the windows a little before disconnecting. When you reconnect it takes like 10 seconds to index it. You literally just hold the window switch in the up position for a few seconds.

Clock issue seems to be resolved. I never updated my firmware but the clock nav gps picks up the signal everytime time now.
Thank You for this information. This is exactly what I was looking for!
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