Taylor-Dunn SC-011-59, Operation, T Roubleshooting And Replacement Parts Manual

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Electrical Troubleshooting
Charger Troubleshooting Page 7
• Test the voltage from the fuse assembly (-) to the diode block (+).
This voltage should be equal to the battery voltage. If the voltage
is less than the battery voltage, then the wires from the harness
connectors to the charger are bad
. Stop here and repair the
problem.
• Test the voltage across the white and black wires that are connected to the timer board. This voltage
should be the same as the rated AC voltage of the charger. If the voltage is less than the rated AC
voltage of the charger, then the wires from the harness connectors to the charger are bad.
Stop here
and repair the problem.
• If the timer relay does not pickup (click) when the AC source is connected, then the timer control circuit
or the relay is bad (refer to Timer Relay Test). Stop here and repair the problem.
• Test the AC voltage across the transformer primary circuit. The transformer primary consists of the two
solid wires with the brown fiber insulator that are connected to the timer board. This voltage should be
the same as the rated AC voltage of the charger. If the voltage is less than the rated AC voltage of the
charger, then the timer relay is bad.
Stop here and repair the problem.
• Test the AC voltage across the transformer low voltage secondary
circuit. The transformer low voltage secondary circuit can be
tested at the two solid wires with the brown fiber insulator that
are connected to the anodes on the two diodes. The voltage
here will vary depending on the state of charge in the batteries.
The voltage should be between 208% and 250% of the rated
DC voltage of the charger. If the voltage is not between 208%
and 250% of the rated DC voltage of the charger, the transformer
is bad and must be replaced.
Stop here and repair the
problem .