SL55/63/65/R230 AMG: lucky guy, SL55 owner. but have battery issues
Thread Starter
Newbie
Joined: May 2015
Posts: 2
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sl55
lucky guy, SL55 owner. but have battery issues
Hi Guys,
Thanks for all the great posts that have helped in the past, i've lurked, but now have an issue i hope you can help with. my sl55 has battery issues, after leaving it unused for 6 months, The electrics battery seems to be dead, and just a week ago teh red message on the dash came up to visit workshop for the front battery, although the car is starting up pretty much as it has always. so am wondering, is the rear battery affecting the front one, and creating the message concerning the starter battery? hoping to not replace the batt if it's just getting confused with the lack of charge on the back battery. Also, what are the chances the rear is just discharged and would be ok with a charge? not great i bet. Thanks guys!
PS Sorry about posting this here, but not seeing the link to post in tHE appropriate forum.
Thanks for all the great posts that have helped in the past, i've lurked, but now have an issue i hope you can help with. my sl55 has battery issues, after leaving it unused for 6 months, The electrics battery seems to be dead, and just a week ago teh red message on the dash came up to visit workshop for the front battery, although the car is starting up pretty much as it has always. so am wondering, is the rear battery affecting the front one, and creating the message concerning the starter battery? hoping to not replace the batt if it's just getting confused with the lack of charge on the back battery. Also, what are the chances the rear is just discharged and would be ok with a charge? not great i bet. Thanks guys!
PS Sorry about posting this here, but not seeing the link to post in tHE appropriate forum.
Super Member
Joined: Jul 2014
Posts: 992
Likes: 245
From: Tucson, AZ
'20 X5 M50i; '17 Ram 3500; Golf Cart; Bikes; Scooters
Any SL sitting 6 months is likely to have battery issues, especially the rear.
Put a battery tender brand, or MB model charger on it...one that switches off when charged, and works on AGM batteries.
If the battery does not hold that charge for a couple days...and you get 'consumer electronics' error on the dash...replace the rear battery. Once bad, they stay bad.
Front battery is only for starting, so it rarely has issues. Check voltages at each battery to confirm.
There is a complicated voltage monitor that shares electrons to and from both batteries, so the car will still work when one fails.
Put a battery tender brand, or MB model charger on it...one that switches off when charged, and works on AGM batteries.
If the battery does not hold that charge for a couple days...and you get 'consumer electronics' error on the dash...replace the rear battery. Once bad, they stay bad.
Front battery is only for starting, so it rarely has issues. Check voltages at each battery to confirm.
There is a complicated voltage monitor that shares electrons to and from both batteries, so the car will still work when one fails.
MBWorld Fanatic!
Joined: Feb 2009
Posts: 6,897
Likes: 85
From: Central WI (BFE)
SL55, ML500 & Acura TL
+1 If I know my car is going to sit for a week, I plug in the my trickle charger. I have the quick disconnect wire permanently attached to the trunk battery so it is very easy. The car sits that way all winter and starts up in the spring like I had just started it the day before.
Member
Joined: Aug 2011
Posts: 75
Likes: 2
From: Ontario, Canada
2005 SL55 amg, 2009 Lincoln MXZ, 2012 Dodge 2500 Limited
I use 2 battery tenders, one for each battery if I plan on not driving for a few weeks. Without tenders, 3 weeks sitting idle will bring on the red warning that consumables are not available.
