Electrical, Battery & StartingBuying adviceCommunity Starter

Battery keeps dying after two or three days parked

CruiseMom94Community StarterJun 4, 20262023 Mercedes-AMG C43 4MATICLos Angeles
Battery tested okay at a parts store, but if the car sits for a weekend it sometimes won't crank. Alternator voltage looks normal while running. How would you narrow down a parasitic draw without pulling every fuse blindly? I'm in Los Angeles. Appreciate any ideas on what to check first.
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9 replies

SmoothMechanicish18Community StarterCommunity StarterJun 4, 2026permalink
Get the messy numbers in writing first. Ask for out-the-door on the 2023 Mercedes-AMG C43 with fees, add-ons, and rate on separate lines. If they balk, that's your answer. On “battery keeps dying after two or three,” that was the fork that mattered for me. Happy to compare notes if your setup is different. If your situation is the opposite, ignore me. I asked for the buyer’s order in email, not a text.
WrenchRunnerCommunity StarterCommunity StarterJun 4, 2026permalink
I'd push back a little: In Los Angeles, insurance quotes flipped a 2023 Mercedes-AMG C43 comparison for me more than the sale price did. That's the part that actually changes the decision. Run the total, not the monthly, before you commit. That's coming from doing this as an owner, not a shop. If the VIN lookup is clean I'm still doing PPI.
EuroBuyer81Community StarterCommunity StarterJun 4, 2026permalink
The trap is a pretty payment hiding a worse car price. If one piece looks too good on the 2023 Mercedes-AMG C43, hunt doc fees, accessories, and the APR next. Screenshot the worksheet if you can. This is from a 2023 Mercedes-AMG C43 in Los Angeles. Write the result down so the next test isn't a repeat of the last one. I'll update if anything new shows up.
CruiseMom94Community StarterCommunity StarterJun 4, 2026permalink
Update from me: I finally have sale price, fees, and trade on separate lines for the 2023 Mercedes-AMG C43. This is the version I'd tell a friend.
CruiseMom94Community StarterCommunity StarterJun 4, 2026permalink
Coming back with numbers — insurance in Los Angeles changed the 2023 Mercedes-AMG C43 comparison more than the sale price did. If the VIN lookup is clean I'm still doing PPI.
CruiseGeek60Community StarterCommunity StarterJun 4, 2026permalink
Hard-won lesson from my last deal: Call your insurer in Los Angeles before you fall in love with the 2023 Mercedes-AMG C43. If they balk, that's your answer. On “battery keeps dying after two or three,” that was the fork that mattered for me. Was this after sitting overnight? Wrote this up on my lunch break.
CruiseGeek60Community StarterCommunity StarterJun 4, 2026permalink
Walk if they won't put it on a buyer’s order. Two 2023 Mercedes-AMG C43 quotes only help if both include tax, title, and the same options. Then the comparison gets honest. Did the worksheet show tax yet? I'll update if anything new shows up.
CruiseMom94Community StarterCommunity StarterJun 5, 2026permalink
OP here. Still looking, but I'm waiting on inspection notes before I send money on the 2023 Mercedes-AMG C43. Not letting add-ons ride along because everyone does.
CruiseMom94Community StarterCommunity StarterJun 5, 2026permalink
Walked a dealership this week on the 2023 Mercedes-AMG C43 and the doc fee was the tell. Sleeping on the number either way.
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