Slip Light
ignition warning light, how does it work?
The light comes on when the ignition is switched on and the engine is not running, it is dim when the fan belt slips.
The light must be powered by the battery but the wire to it comes from the alternator. With the engine running the battery is charged by the alternator so why does the light not stay on with the engine running? its just a light, on or off but I don't get how it knows where the power is coming from
"Live" wire from Ignition switch to warning light bulb----- Wire from other side of bulb to alternator, (or in older cars, Dynamo)
When you switch on the ignition, you get a live to the warning light bulb, and the "Stationary" Alternator/dynamo acts as an earth, so the bulb lights up.
When you start the engine, The alternator
gives out 12 volts and cancels out the 12 volts from the ignition switch that is lighting the bulb, so the bulb is now getting 12 volts from either side, (no earth) and goes out.
If for any reason there is very low or almost nil output from the alternator/dynamo, then the bulb will "glow".
It is a similar situation when you have a "fuse-blown" warning light.
A "small" warning bulb is connected to either side of the fuse and if the fuse blows
then whatever is supposed to be lit or working acts as an earth, and the warning light lights up.
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