SL55/63/65/R230 AMG: 2003 sl55 battery drain , advice wanted
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Member
Joined: Apr 2012
Posts: 179
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Sl55 2003
2003 sl55 battery drain , advice wanted
Ok 2003 sl55
new batts
new bcm and alt
seat modules doe drain 200 MA pulled fuse
BAtt drain is at 1.5 Amp there is a short there is continuity between pos and neg any Idea how to locate , fuse pulls and relay pulls attempted no change on drain.
If you are in NY and can help I would appreciate it.
new batts
new bcm and alt
seat modules doe drain 200 MA pulled fuse
BAtt drain is at 1.5 Amp there is a short there is continuity between pos and neg any Idea how to locate , fuse pulls and relay pulls attempted no change on drain.
If you are in NY and can help I would appreciate it.
Senior Member
Joined: Mar 2021
Posts: 273
Likes: 21
From: Rocky Mountains, Colorado
Just sold my '11 Porsche TurboS cab for an '03 SL55!
Check the pneumatic (air) pump that's located directly under the Convertible Top hydraulic pump in the left bottom trunk area. These are said to run when they fail or there is a leak in the system. The pump has to maintain pressure with ignition off so the door and trunk locks will operate. You can reach under the foam and touch this pump(box) as a crude check, or find the relay/fuse. If the looks are terribly sluggish that would be a clue also.
Let us know what you find please.
Let us know what you find please.
Super Member
Joined: Jan 2007
Posts: 979
Likes: 38
From: South Africa
2018 E63s AMG (Current) 2011 CL63 AMG (Sold) 2005 CLS55 AMG (Sold) 2004 C32 AMG (Sold)
My battery drain was from the factory alarm system. There is a separate battery supply box for the factory system and those batteries get old and known to short causing a drain. Not saying its your issue, but another place to check... Not sure about the SL, but on my RHD CLS55 the battery pack for the alarm was in the right hand wheel well..
Super Member
Joined: Jan 2007
Posts: 979
Likes: 38
From: South Africa
2018 E63s AMG (Current) 2011 CL63 AMG (Sold) 2005 CLS55 AMG (Sold) 2004 C32 AMG (Sold)
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Senior Member
Joined: Mar 2021
Posts: 273
Likes: 21
From: Rocky Mountains, Colorado
Just sold my '11 Porsche TurboS cab for an '03 SL55!
If it's not an electrical load down steam (down circuit) from any fuse or relay, then it would seem to be a short (partial short) somewhere between the battery and the fuse/relay boxes. Have you also checked the main fuses just forward of the rear battery? The other idea that comes to me is to access the BCM (or Power Control Module) on the inside rear of the RR wheel well, and progressively pulling each of the main power out lines, and then each of the control connectors while monitoring the current drain. Maybe that will lead you somewhere.
Probably wise to spend some time studying the electrical schematics.
Let us know when you solve the mystery please.
Probably wise to spend some time studying the electrical schematics.
Let us know when you solve the mystery please.
