2012 Honda Fit Won't Start - No Accessory power, only dash lights

Question

Car won't start; when I attempt to turn the key, there's no turning over or clicking of any kind. No accessories come on (A/C, radio, etc.), but the interior lights will turn on. They seem slightly dim, but it is day time.
I used a Black & Decker 15 amp charger to check the battery and after probably 20 minutes it said FLO, or float, which I think means that the charger thinks the battery is completely charged and in float mode. The car still won't turn over or start at all, no radio or A/C. Please help. I know some possibly culprits are the starter and alternator, or possibly the ignition switch, barring my battery itself going bad.

Zaid · Answer

If the battery is fully charged and can power the interior lights there's little reason to doubt it.
I would rule out a bad alternator/charging system because the battery did not require much time to reach full charge.
You have already mentioned most of the common reasons for a no-crank condition. Here are a few more:

Poor connection between the battery and starter
This includes corroded terminals, bad ground and bad wires
A failing starter
In which case whacking the starter with a heavy implement might help
Lack of ignition command
Reasons include a failing ignition switch and bad ignition relay

2012 Honda Fit Won't Start - No Accessory power, only dash lights

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