Why keeps my car killing alternators with no visible electrical issue?
Recurring alternator failures are notoriously hard to diagnose when visual checks of wires, grounds, and battery terminals show no obvious defects and you lack electrical expertise. The core difficulty is catching the intermittent voltage drops — such as erratic starts reading 11.2v instead of the normal 13.4v — while the engine is running and ready to test.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Checking battery terminals, grounds, and wires
- 2Checking fuses for incorrect sizing
- 3Inspecting voltage regulator wiring and alternator connectors for heat damage
- 4Keeping a multimeter in the car to test voltage immediately upon noticing a low reading
- 5Removing the splash shield to access and test the alternator and battery connections directly
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“My car has killed 3 alternators in 6k kms. I have zero idea what im doing with electrical stuff.”source ↗
“I’ve checked my battery terminals, my grounds and my wires and I can’t see any issues popping straight out at me.”source ↗
“I honestly don’t even know where to start with this.”source ↗
Where this came up
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