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2009 SL550
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Rudeney...agree. My alternator change removed some funky codes...and I think it was the VR.
200 bucks and 2 hours. I had fun changing it and the problem is gone. (WIN/WIN)
 

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2009 SL550
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414 Posts
Here are 2 ideas
1. Stop spending on parts and labor without deep dive diagnostic work
2. Use the proper tools for diagnostics , DAS Xentry. In your case it appears to me you have a parasitic battery drain. I would use a The Power Probe 4 is a multi-use Circuit Tester with built-in diagnostic power. This tool simplifies the testing of fuse boxes, verifies correct operation of motors, lights, relays, sensors, wires, communications circuits and computer drivers. The large LCD color display makes viewing live test information and mode selection simplified in even direct sunlight or complete darkness.https://www.pp-tek.com/store/product/power-probe-4/
parasitic draw is NOT on the starting battery and the red icon is from the starting battery. (MB using a starting battery started with avoiding parasitic draw keeping the car from starting, so the extra battery for everything else, FYI)

It points to the BCM or the voltage regulator in the alternator.
Further discussion about this helps the community, so tell us more, like your opinion and feelings because we are listening.

Side note: Lewis Hamilton is bad-ass...anybody who watched the race in Brazil today knows what Im saying. WOW!
Additional Side note...looking at a private seller - 2011 S63 tomorrow, think I'm in, thoughts? (asking is 24900 at 76K miles)
 

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Registered
2009 SL550
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414 Posts
Perhaps…
Glad to see all these components didn’t get caught up in the capacitor plague of the early 2000s. Numerous components and musical equipment I repaired were as simple as replacing caps. 20 cent parts and an hour labor restored 1000 dollar equipment (or 10,000 dollar equipment). The bigger problem is when they leaked and destroyed on-board semiconductors. End of game.
I fixed lots of computer power supplies and was glad to grab musical gear folks thought were totaled, because symptoms were no power or blown speakers and stuff and the only problem was a popped cap. Being the fair guy I am, my buddies got their gear back, fixed for free.
So easy.

My curiosity is the plastics and rubber in cars as they age. Nothing to do when they fail but replacement, and these plastics are everywhere. Thoughts go to a guy that recreated an intake manifold for a 944 Porsche (plastic) on his additive printer because the part wasn’t available. He fixed his car and shared the file with others. Think he won some kinda award for the work too. Nice.
I’m in the waitlist for the new Ford maverick to replace my Honda ridgeline as an occasional truck that makes Costco and ikea runs. Half the engine of the new Ford is plastic, and that’s just the start. As these age, they breakdown, crack, etc. a few things under the hood of my 230s have turned into marzipan, so this is an issue.I think the plastic should breakdown, thinking about disposal and what happens 50 years from now, but if you have a 20+ year old car, still running its something to consider and perhaps prepare for.


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