Changes

The 12 volts supplied to all motorhome appliances, outlets and accessories is routed from the batteries through a main 12 volt master switch and routed through busses to the individual branches, or zones, that are serviced from this supply. Circuit breakers are located behind the access panel at the top front left side of the coach, lower front load center (behind removable panel outside front of coach) and at each of the zones. The circuits supplied and fuse or circuit breaker protection at each zone are shown on diagrams included in Section X. A typical load center is shown in figure 4-1.  

The 12 volts supplied to all motorhome appliances, outlets and accessories is routed from the batteries through a main 12 volt master switch and routed through busses to the individual branches, or zones, that are serviced from this supply. Circuit breakers are located behind the access panel at the top front left side of the coach, lower front load center (behind removable panel outside front of coach) and at each of the zones. The circuits supplied and fuse or circuit breaker protection at each zone are shown on diagrams included in Section X. A typical load center is shown in figure 4-1.  

==== Battery Heaters ====

====Battery Heaters====

120 volt ac battery heater pads provide faster engine starts during cold weather conditions by increasing the available cold cranking power. Heaters operate only from the ac supply line via the Battery Heater switched by 120 volt breaker only.  

120 volt ac battery heater pads provide faster engine starts during cold weather conditions by increasing the available cold cranking power. Heaters operate only from the ac supply line via the Battery Heater switched by 120 volt breaker only.  

'''''Note''' To avoid premature deterioration of the batteries, heaters should be used only when the temperature is below 32°F.''  

'''''Note''' To avoid premature deterioration of the batteries, heaters should be used only when the temperature is below 32°F.''  

==== Battery Chargers ====

====Battery Chargers====

The 12 volt coach battery supply , figure 4-2, and the generator battery are maintained fully-charged by either the engine alternator (when engine operates); or by battery charger.  

The 12 volt coach battery supply , figure 4-2, and the generator battery are maintained fully-charged by either the engine alternator (when engine operates); or by battery charger.  

[[File:1989 WB Manual Figure 4-2 Battery Compartment.png|right|frameless]]

[[File:1989 WB Manual Figure 4-2 Battery Compartment.png|right|frameless]]

Batteries can become discharged because of coach 12 volt loads, while parked, without a 120 volt ac source. For overnight stops this presents no problem , with judicious use of 12v. service, because the engine alternator will recharge the batteries rapidly during the next day's travel. When operating from shoreline or generator power, the batteries obtain the major portion of the charge during "sleeping" time , while coach loads are low, so that the battery charger can "top off" the batteries . If it is planned to leave the coach parked without exterior power for two days or longer turn off the Electronic Master switch in overhead cabinet adjacent to left front load center. This will ensure that there is no drain from the circuits which remain on when the Master (under dash) switch is Off (clock, memory and LPG leak detector).  

Batteries can become discharged because of coach 12 volt loads, while parked, without a 120 volt ac source. For overnight stops this presents no problem , with judicious use of 12v. service, because the engine alternator will recharge the batteries rapidly during the next day's travel. When operating from shoreline or generator power, the batteries obtain the major portion of the charge during "sleeping" time , while coach loads are low, so that the battery charger can "top off" the batteries . If it is planned to leave the coach parked without exterior power for two days or longer turn off the Electronic Master switch in overhead cabinet adjacent to left front load center. This will ensure that there is no drain from the circuits which remain on when the Master (under dash) switch is Off (clock, memory and LPG leak detector).  

==== DC Supply Monitors ====

====DC Supply Monitors====

'''The ALT/CHGR METER''', located on the lower dash , indicates the total current flow from the charging source (engine alternator or battery chargers).  

'''The ALT/CHGR METER''', located on the lower dash , indicates the total current flow from the charging source (engine alternator or battery chargers).  

After a trip, '''CHARGE''' ammeter may show some discharge reading, even when 120v. source is supplied, if there is a load on the 12v. coach circuits. The Float type battery charger allows a voltage of 12.5-13 when there is a load.  

After a trip, '''CHARGE''' ammeter may show some discharge reading, even when 120v. source is supplied, if there is a load on the 12v. coach circuits. The Float type battery charger allows a voltage of 12.5-13 when there is a load.  

=== AC Supply System ===

===AC Supply System===

[[File:1989 WB40 Manual Figure 4-3 AC Power Selector Switch.png|right|frameless]]

[[File:1989 WB40 Manual Figure 4-3 AC Power Selector Switch.png|right|frameless]]

Motorhome ac-operated appliances are supplied from either an external shoreline hookup or from the on-board generator. Selection of shoreline or generator power source is determined by a four-position ac power selector switch located in a floor compartment between the co-pilot's seat and right sidewall as shown in figure 4-4. Set this switch to either '''Gen, Shore 50A, Shore 30A or Off''', depending on the power source availability . Leave this switch in '''Off''' position to completely disconnect the motorhome 120 volt ac circuits normally supplied by these inputs.  

Motorhome ac-operated appliances are supplied from either an external shoreline hookup or from the on-board generator. Selection of shoreline or generator power source is determined by a four-position ac power selector switch located in a floor compartment between the co-pilot's seat and right sidewall as shown in figure 4-4. Set this switch to either '''Gen, Shore 50A, Shore 30A or Off''', depending on the power source availability . Leave this switch in '''Off''' position to completely disconnect the motorhome 120 volt ac circuits normally supplied by these inputs.  

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==== Power Line Monitors ====

====Power Line Monitors====

A dual power line monitor is located on the copilot's overhead dash to monitor the voltage in both legs of the ac shoreline supply (or generator supply). The monitors have a polarity and ground detector circuit to indicate possible electrical hazards due to incorrect hookups. A power line polarity monitor is located in the shoreline/utility box (figure 4-5).  

A dual power line monitor is located on the copilot's overhead dash to monitor the voltage in both legs of the ac shoreline supply (or generator supply). The monitors have a polarity and ground detector circuit to indicate possible electrical hazards due to incorrect hookups. A power line polarity monitor is located in the shoreline/utility box (figure 4-5).  

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==== AC Circuit Breaker Panels ====

====AC Circuit Breaker Panels====

The main ac circuit breaker panel is located in the bedroom. See figure 4-4.  

The main ac circuit breaker panel is located in the bedroom. See figure 4-4.  

[[File:1989 WB40 Manual Figure 4-4 - AC Circuity Breaker Panel.png|right|frameless]]

[[File:1989 WB40 Manual Figure 4-4 - AC Circuity Breaker Panel.png|right|frameless]]

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==== Generator Operation ====

====Generator Operation====

The generator plant has its own 12 volt starting battery so that it can be started independently of the coach 12 volt batteries.  

The generator plant has its own 12 volt starting battery so that it can be started independently of the coach 12 volt batteries.  

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==== Shoreline Operation (Commercial Power) ====

====Shoreline Operation (Commercial Power)====

[[File:1989 WB40 Manual Figure 4-5 Shoreline Utility Compartment .png|right|frameless]]

[[File:1989 WB40 Manual Figure 4-5 Shoreline Utility Compartment .png|right|frameless]]

Shoreline Operation (Commercial Power) Set the power selector switch, figure 4-3, to Off position before the motorhome electrical system and external supply are joined. Caution Your motorhome has been wired in accordance with the National Electrical Code. All 120 volt ac wiring is two-wire service with ground; all 240 volt wiring is three-wire service with ground. If the motorhome is connected to an external hookup which has only a two-wire circuit, ground the third wire on the adapter to the external supply metal junction box or conduit. '''''For personal safety, check the polarity detector indicators on the power line monitors to be sure that lines are properly connected and grounded.'''''  

Shoreline Operation (Commercial Power) Set the power selector switch, figure 4-3, to Off position before the motorhome electrical system and external supply are joined. Caution Your motorhome has been wired in accordance with the National Electrical Code. All 120 volt ac wiring is two-wire service with ground; all 240 volt wiring is three-wire service with ground. If the motorhome is connected to an external hookup which has only a two-wire circuit, ground the third wire on the adapter to the external supply metal junction box or conduit. '''''For personal safety, check the polarity detector indicators on the power line monitors to be sure that lines are properly connected and grounded.'''''  

|1.0

|1.0

|-

|-

|Dattery Charger (depends on battery condition / load)  

|Dattery Charger (depends on battery condition / load)

|0 to 14.0

|0 to 14.0

|-

|-

|4

|4

|-

|-

|Refrigerator  

|Refrigerator

|2.7

|2.7

|-

|-

|14.0

|14.0

|-

|-

|Instant Hot Water  

|Instant Hot Water

|6.5

|6.5

|}

|}

==== Troubleshooting ====

====Troubleshooting====

Your coach is designed and tested to make sure the 120v. ac Neutral (white) wire and the Ground (bare copper or green) are not tied together (no continuity). This will prevent any danger of a "hot skin" if the source of power has reversed polarity (red LED lit).  

Your coach is designed and tested to make sure the 120v. ac Neutral (white) wire and the Ground (bare copper or green) are not tied together (no continuity). This will prevent any danger of a "hot skin" if the source of power has reversed polarity (red LED lit).  

{| class="wikitable"

{| class="wikitable"

|Red LEDs Lit

|Red LEDs Lit

|Reversed Polarity at power source

|Reversed Polarity at power source

|Convince park management to correct or change lot assignment.  

|Convince park management to correct or change lot assignment.

|-

|-

|Neither Red or Green LEDs

|Neither Red or Green LEDs

|-

|-

|Green AND Red LEDs glow when additional load is turned on (Air Conditioner or Water Heater).

|Green AND Red LEDs glow when additional load is turned on (Air Conditioner or Water Heater).

|Poor ground connection at park (floating ground).  

|Poor ground connection at park (floating ground).

|Make sure shoreline plug is fully engaged twist locked (clockwise) at coach.  

|Make sure shoreline plug is fully engaged twist locked (clockwise) at coach.

|}

|}

==== Safeline Alarm ====

====Safeline Alarm====

Your coach is equipped with a shoreline disconnect alarm , which is located on the upper left auxiliary dash. This device will provide an audible or visual alarm whenever the shoreline is left connected to the coach at the same time that the ignition switch is turned On. This assures that the coach is not inadvertently driven away while still connected to the shoreline hookup.  

Your coach is equipped with a shoreline disconnect alarm , which is located on the upper left auxiliary dash. This device will provide an audible or visual alarm whenever the shoreline is left connected to the coach at the same time that the ignition switch is turned On. This assures that the coach is not inadvertently driven away while still connected to the shoreline hookup.  

=== Audio System Warning ===

===Audio System Warning===

Low-voltage audio system wiring is run throughout the coach between the stereo radio, speakers , headphone jacks , volume controls and amplifiers. These interconnections are shown on wiring diagrams provided in Section X.  

Low-voltage audio system wiring is run throughout the coach between the stereo radio, speakers , headphone jacks , volume controls and amplifiers. These interconnections are shown on wiring diagrams provided in Section X.  

=== Electronic Master Switch ===

===Electronic Master Switch===

Most of the electronic circuits are de-energized when the main Master switch (behind dash) is turned Off (relay action). Circuits that still receive power when the Master switch is off serve the monitor panel, clocks , radio memory, and LPG leakage detector. If coach is to be stored for two days or more without external power, the Electronic Master switch in the front overhead kitchen cabinet on driver's side should be turned off.  

Most of the electronic circuits are de-energized when the main Master switch (behind dash) is turned Off (relay action). Circuits that still receive power when the Master switch is off serve the monitor panel, clocks , radio memory, and LPG leakage detector. If coach is to be stored for two days or more without external power, the Electronic Master switch in the front overhead kitchen cabinet on driver's side should be turned off.  

=== Battery Jumper Terminals ===

===Battery Jumper Terminals===

For your convenience and safety when jump starting (usually someone else's vehicle), terminal posts are provided in the upper curb side of the engine compartment. Utilization of these terminal posts is described in Section VIII.  

For your convenience and safety when jump starting (usually someone else's vehicle), terminal posts are provided in the upper curb side of the engine compartment. Utilization of these terminal posts is described in Section VIII.  

=== Battery Storage in Freezing Weather ===

===Battery Storage in Freezing Weather===

Batteries that are not kept full-charged must be given protection against freezing. Partially charged batteries will freeze at low temperatures , so batteries must either be left charged or removed from the vehicle and stored in a warm location. The motorhome can be left connected to the shoreline ac supply and the coach battery chargers will keep all batteries charged. Note that even in a warm location it is advisable to keep the batteries charged to prevent deterioration. The six· main coach batteries should be checked for proper electrolyte level: add water, as required. The battery used for the generator is sealed.<br />

Batteries that are not kept full-charged must be given protection against freezing. Partially charged batteries will freeze at low temperatures , so batteries must either be left charged or removed from the vehicle and stored in a warm location. The motorhome can be left connected to the shoreline ac supply and the coach battery chargers will keep all batteries charged. Note that even in a warm location it is advisable to keep the batteries charged to prevent deterioration. The six· main coach batteries should be checked for proper electrolyte level: add water, as required. The battery used for the generator is sealed.<br />

==Liquefied Petroleum Gas (LPG) Systems==

==Liquefied Petroleum Gas (LPG) Systems==

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In 2019, we noticed a strong gas smell outside our 1989 WB 40 near the LP bay. Luckily, I was able to quickly locate the leak with some soapy water in a spray bottle. The leak was coming from a rubber gasket between first and second stage of the regulator ''(See Picture A)''.  The regulators that Blue Bird originally installed are obsolete, so I replaced mine with a '''FISHER''' '''R232A-BBFXA 1/4 INLET 1/2 OUTLET''' ''(see picture B)'' '''t'''hat I found on eBay. Keep in mind that the life span of the diaphram in these regulators is around 20 years on the high pressure side, so if your coach is getting up there in age, you'll want to have a spare regulator onboard.

 

 

 

==Air Brake Systems==

==Air Brake Systems==