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BI-DIRECTIONAL ISOLATOR RELAY DELAY 131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00362-100 Rev. C 060805
www.intellitec.com
Intellitec
SERVICE MANUAL
BI-DIRECTIONAL ISOLATOR RELAY DELAY
Product Description
The BIRD (BI-DIRECTIONAL ISOLATOR RELAY DELAY) performs two important functions. It provides a
method of charging the coach battery from the engine alternator and charges the chassis battery from the
converter when the coach is plugged into shore power. When neither battery is being charged, the batteries
are isolated from each other to prevent the loads of one battery from inadvertently discharging the other battery.
The unit is housed in a plastic enclosure suitable for mounting under the hood, out of direct water spray. It
operates in combination with a continuous duty solenoid to connect the two batteries at the proper times for
charging.
Note: The BI-DIRECTIONAL ISOLATOR RELAY DELAY controls the Isolator Relay which is connected
directly to the chassis and coach batteries. Power from both the batteries is fed into the module. The full
power of the battery may be available at this module. Inadvertent shorts at this box could result in
damage and/or injury. All servicing of this module should be done only by a qualified Service Technician.
Tools required: Low current Test Light, Accurate Voltmeter (digital read-out preferred)
00-00362-100 BIRD GAS 131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00362-100 Rev. C 060805
www.intellitec.com
Intellitec
SERVICE MANUAL
BI-DIRECTIONAL ISOLATOR RELAY DELAY
How It Works
Engine Alternator Charging the Batteries
Converter Charging the Batteries
The BIRD operates in conjunction with a continuous duty solenoid to provide the isolator/battery charging
functions of a motor home. It senses voltage on the coach and chassis batteries. If the voltage on either one is
above 13.1 volts, indicating the battery is being charged, it closes the isolator relay, paralleling the batteries,
charging both. It operates in two directions, charging the batteries from the engine alternator and charging the
batteries from the converter. These functions are similar but operate at different thresholds.
When the ignition switch is turned on and the engine is running, the system senses the level of voltage on the
chassis 12 volt system. When this voltage goes
13.1 volts for approximately 2.5 minutes, as happens
when the engine is running normally (normal alternator output voltage of a cold engine is approximately 14.4
volts), it will close the isolator relay providing charging current to the
battery. This delay allows a cold
engine an opportunity to start and warm up before having the heavy load of a discharged coach battery placed
on it.
If the voltage should fall
12 volts for more than about 1 minute, the relay will drop out to feed all the
alternators available output to the chassis battery to keep the engine running. This might happen when the
alternator is not able to supply sufficient current to all of the loads and charge the coach battery at the same
time. When the chassis voltage goes
13.1volts again, the relay will again close in about 2.5 minutes to
retry to charge the
battery. The resultant flickering of lights would alert the driver of the system overload.
When the coach is plugged into shore power and the ignition is off, the unit senses the voltage on the coach
batteries. When this voltage goes
13.1 volts for approximately 2.5 minutes, as happens when the
converter isn't heavily loaded, it will close the isolator relay providing charging current to the
battery.
If the voltage should fall
12.6 volts for more than about 1 minute, the relay will drop out to prevent the
coach loads from discharging the chassis battery. This might happen when the converter is heavily loaded by
coach loads. When the coach battery voltage goes
13.1 volts again, the relay will again close in about 2.5
minutes to retry to charge the
battery.
above
below
above
above
below
above
coach
coach
chassis
chassis 131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00362-100 Rev. C 060805
www.intellitec.com
Intellitec
SERVICE MANUAL
BI-DIRECTIONAL ISOLATOR RELAY DELAY
Trouble Shooting
Problem
Possible
Cause/Solution
Coach battery not charging from engine.
Chassis battery drains into coach
Isolator relay "clicking" on and off.
Check for open circuit breaker to coach battery.
With engine running, chassis voltage must be above
13.5 volts. If less than 13.1 volts, check vehicles
charging system.
Check ground on module.
Check for voltage on coil of isolator relay after engine
has been running for at least 20 seconds. Voltage
should be approximately 12 Volts.
If no voltage,
replace BIRD.
If 12 volts is applied to isolator relay coil, check for
voltage drop across the isolator relay contacts. If the
drop is greater than 0.2 volts, replace relay.
Check for ignition voltage on module with ignition off.
Should be 0 volts. If not check wiring.
Check for continuity across the isolator relay
contacts, the relay should be open with no voltage
applied to coil.
Battery voltage falling below 12.6 when plugged in or
12.0 when engine is running. This is normal with
heavy loads or low batteries. 131 Eisenhower Lane North
Lombard, IL 60148
630.268.0010 / 1.800.251.2408
P/N 53-00362-100 Rev. C 060805
www.intellitec.com
Intellitec
SERVICE MANUAL
BI-DIRECTIONAL ISOLATOR RELAY DELAY
TYPICAL
INST
ALLA
TION
DIAGRAM