What voltage should come out of a 24 v 3 pin charger? single 12 v pin with two ground pins?
It depends on how it and the wheelchair are wired and how the voltage is derived.
Presumably the 24 volt wheelchair requirement is provided by two 12 volt batteries connected in series and these could be recharged in series by a 24 volt charger and a pair of wires or by a 12 volt charger providing a 12 - 0 - 12 using three wires where one 12 is a positive in relation to the 0 and the other is a negative in relation to the zero making a potential difference of 24 volts.
There could conceivably be circuitry within the wheelchair that requires only 12 volts for recharging and causes the two batteries to be charged separately, though while this method could be desirable and offer some benefits it would be considered unnecessarily expensive and complicated for most commercial purposes.
As usual you really need to know what is supposed to happen or is designed to happen before fault-finding can begin. One of the wires could be a safety ground wire but most likely it is used to provide some sort of feedback to the charger from, perhaps, a thermal switch close to the batteries so charging will cease if too much heat is generated.
Nov 02, 2015 |
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