1485 Jacobs Rd.
Deland, FL 32724
386.738.7307
P/N 53-00563-100 Rev. B 032619
www.Intellitec.com
Intellitec
SERVICE MANUAL
ELECTRIC STEP POWER SELECTOR
The Power Selector operates by monitoring the voltage on the coach battery. As long as that voltage is above
11.2 volts, the power to the step will be supplied from the coach battery. If the voltage falls below 11.2 volts, the
Power Selector will provide power to the step from the chassis battery. When the coach battery voltage rises
above 12.1 volts, the Power Selector will again provide power to the step from the coach battery.
Whenever the ignition is on, the Power Selector will automatically supply the power from the chassis battery.
The Power Selector supplies power to the three power inputs (power, switch, and ignition) to the electric step to
assure proper voltages to all these inputs. When power is applied to the coach battery input of the Power
Selector, a SPDT relay is used to select which battery will supply battery power to the step. Electronic circuitry
is used to reduce the amount of current drawn by this relay to conserve battery power. The Power Selector then
checks to see if the kill switch is switched on. If it is switched off, the relay is turned off to conserve battery
power. If the kill switch is turned on, the relay will be pulled in again.
To conserve the battery power, the Power Selector senses the current drawn by the indicator light in the Step
On/Off switch and turns off the relay if the switch is turned off.
The Power Selector operates by monitoring the voltage on the coach battery. As long as this voltage is above
11.2 volts.
To check the operation of the Power Selector, disconnect the chassis battery and operate the electric step by
opening and closing the door. The step should operate normally. If not, check the voltage of the coach battery
at the Power Selector. It should be above 11.2 volts.
Re-connect the chassis battery and disconnect the coach battery. Check the operation of the electric step. It
should operate normally.
How It Works
Checking the Operation
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