How does this elderly Voltage Limiter work?
This is a Voltage limiter, for my Fuel, coolant temp, and oil pressure gauges in my '89 Dodge van. It plugs into my gauge cluster and is not extremely simple to access. My Factory service ...
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I actually know how those work,, They are vibrators basically, or choppers
You have, basically, a relay in side the box. And possibly a small condenser.
The relay is normally closed, that is the HOT (Battery) wire is connected to the output (METERS) wire. and to the condenser.
As the voltage rises the magnet coil pulls the relay open, Now the condenser is powering thigns,, This does not go on long, but the coil now drops the armature (since the voltage, and thus the current, is falling) and it returns to connected state, then the voltage rises and the magnet pulls the armature in again, opening the relay and.. This happens several times a second.
Thus it is a chopper.. chopping the incoming voltage to lower it.
You have, basically, a relay in side the box. And possibly a small condenser.
The relay is normally closed, that is the HOT (Battery) wire is connected to the output (METERS) wire. and to the condenser.
As the voltage rises the magnet coil pulls the relay open, Now the condenser is powering thigns,, This does not go on long, but the coil now drops the armature (since the voltage, and thus the current, is falling) and it returns to connected state, then the voltage rises and the magnet pulls the armature in again, opening the relay and.. This happens several times a second.
Thus it is a chopper.. chopping the incoming voltage to lower it.
