BATTERY DISCONNECT
SERVICE MANUAL
THE SYSTEM
A typical motor home may use one or two relays to disconnect the batteries. These relays are usually
independent and operate from a switch panel located inside the coach. A harness is used to connect from the
panel to the relays. The Intellitec/Nuvatec panels are offered in four models. They are:
BD0 - Single battery system, with a cable and monitor panel with an on/off indicator
BD1 - Single battery system, with a cable and monitor panel with an on/off indicator and digital voltmeter
BD2 - Dual battery system, with cable and monitor panel with two on/off indicators and ignition interlock relay.
BD3 - Dual battery system, with cable and monitor panel with two on/off indicators, digital voltmeter, and
ignition interlock relay.
Note: BD1 panel can be interchanged with BD0, and BD3 and be interchanged with BD2
The dual relay panels include an ignition interlock relay that opens the power circuit to the chassis battery relay
when the ignition is turned on, to prevent the battery from being accidently opened when the engine is running.
A typical circuits is shown in FIGURE 5 and FIGURE 6. The switches are each double pole, double throw,
momentary, center off. Operating the switch in either direction will cause the relays to open or close,
depending on the polarity of the voltage applied.
FUSES
There are two 5 Amp fuses for the system, mounted on each relay. Looking at the relay with cap at the top, the
fuse on the right feeds the LED indicator and if so equipped, the digital voltmeter. The fuse on the left feeds the
power to the switch that operates the solenoid.
131 Eisenhower Lane North
Intellitec
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
www.intellitec.com
5
P/N 53-00066-100 Rev. B 030905
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