Most chargers are 3 pin. Plus and minus charging voltage to the
batteries and a third pin monitors the actual battery voltage, so
that the automatic charger can turn itself off once the batteries
are fully charged. As Brad has mentioned, the connection
from the charger has to be made for the charger to produce
a voltage at those pins. The best way to see if it is charging
is to remove the seat and measure across both batteries..
assuming it's a 24volt system like most. Charging voltage
can be as high as 28volts across the positive of one 12volt
battery (connected in series to the other 12v battery) and the
negative of the other battery. You can monitor the charging
voltage across the batteries with a digital volt meter.
The first guy must work not work on Rascals,
if you look at the gauge and plug in your charger does the tiller gauge go up to the top, then the charger is working. if nothing happens there is a flat white plug connecting to the controller, make sure those pins are pushed all the way in. with the charger plugged in are there any lights on? there should be a power light and a charging light. these are smart chargers and will not charge if the batteries are below 16volts, you can fool this by jumper cables from another battery to one of the batteries then the charger will start then quickly remove the cable to the batteries. But if you are resorting this then it may be time for batteries. it is important to rule out the charger as it is $158- $204 each! I have other useful stuff on Rascals and other makes at www.strege.com/BlueDoc it is about to become an app!
I’m happy to assist further over the phone at https://www.6ya.com/expert/bill_bcbb89783b08c489
Some chargers have a sensing circuit that has to "see" the battery before it will allow any voltage to go out and charge it.
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