Troubleshooting - Here are a few steps you can follow to help isolate the problem of your lube pump system.  You will need a Voltage and an Amps meter.

Go to the sockets on both the Motor Home and the Towed Vehicle.  Make sure there are no loose wires on the back of the connection.  Check the grounds, make sure they are grounded correctly, and not onto any painted steel.  Spread the pins at both sockets with a flat screw driver and use some WD40 to chase out any moisture if you have been through any weather lately.

With your voltage meter and the system hooked up (car connected to RV) with the lube pump running (RV Engine running) check the following levels:

-At the Monitor

Blue Wire = 13.5 Volts (Wire goes to 12V Battery Source)
Orange Wire = 13.5 Volts (Wire goes to 12V Ignition Source)-Turn Motorcoach on.
Red Wire = 12.0-12.5 Volts (Output (Power) to Lube Pump)
Black Wire = 12 Volts (Return Voltage of system from Pressure Switch)
White Wire = 0 Volts (GROUND)

If you are unable to check the voltages with the towed vehicle hooked up, you can still check the monitor.  Just keep in mind that one will not have voltage on the black wire and the monitor will continually alarm.  This is normal as it is searching for the towed vehicle.  This is annoying as the alarm is going off, but one can still troubleshoot the Motor Coach side of the installation like this.  Measurements should look like this without the Towed Vehicle hooked up:

-At the Monitor (without towed vehicle)

Blue Wire = 13.5 Volts (Wire goes to 12V Battery Source)
Orange Wire = 13.5 Volts (Wire goes to 12V Ignition Source)-Motorcoach on
Red Wire = 12.0-12.5 Volts (Output (Power) to Lube Pump)-Monitor on
Black Wire = 0 Volts (Return Voltage of system from Pressure Switch)
White Wire = 0 Volts (GROUND)

If you are receiving these correct voltage readings at the monitor, your next step will be to go back to socket located on the back on the Motor Coach and check the voltage on the 10 o’clock pin (red wire).  It should be 12 volts.  If it is less than 12 volts at the socket, but between 12-12.5 volts at the back of the monitor (red wire), this would indicate that we have a poor connection on the red wire.  One would want to locate this poor connection (it will be somewhere down the length of your coach) and repair it.  In Remco’s experience, when someone locates a poor connection on the red wire, they do not look for the poor connection; instead they just replace the red wire running down the length of the coach.  When replacing this wire, Remco recommends the use of 14 gauge wire.


Warning: Touching the wrong pins on the Motor Coach socket could damage the monitor!

If the voltage on the 10 o’clock pin is 12 volts then the troubleshooting of the red wire has been satisfied.  The final check on the monitor would be to jump a wire from the 10 o’clock pin to the center pin.  Once you jump a wire between the two posts on the Motor Coach socket the monitor should go from Red to Green and the audible alarm should cease alarming.  One should not have any red light on the monitor whatsoever.  If you do, then you either have a bad controller (monitor) box and it needs to be replaced or the black wire has an open and should be replaced.

Note: If monitor is alarming when in the “off” position.-Is car hooked up? Turn the monitor on.

If the Lube Pump controller (monitor) is alarming even when in the “off” position, it is recommended that you check the voltages on both the Blue and the Orange wire to determine that the controller is receiving the proper voltage (12-13.5 Volts).  Also, check the fuses on both wires to make sure they have not blown.  The Blue wire contains a 10 amp fuse and the Orange wire contains a 1 amp fuse.  If either of these fuses have blown, please replace and finish troubleshooting.  If fuses are in tact and the monitor controller is receiving proper voltage, yet the monitor controller still alarms in the “off” position, then the monitor is defective and will need to be replaced.

Red Wire = 12 Volts pump needs at least this or will not operate correctly.  We normally see a 1/2 volt drop from Red wire at monitor to Red Wire at Pump. Perfectly normal is that is the case, but Pump needs at least 12 Volts – NOTHING LESS)
Black Wire at the Pump = 0 Volts (GROUND)

With an Amp meter check the Amps on the pump.  If the pump is operating normally it will be pulling between 2.0-4.5 Amps.  Anything above or below that threshold means the pump is GOING OR IS BAD.

If you do not have access to an Amperage Meter you can also perform a volume test on the pump to see if it is operating properly.  When the pump is getting 12 Volts of power it should be outputting a 1 quart of fluid per 12 seconds.  If pump is outputting less than a quart in the allotted time then the pump needs to be replaced.

Finally, check the voltage level at the Pressure Switch.  There is a Pressure switch assembly in every type of Remco Lube Pump Application.  On the top of the pressure switch assembly is the pressure switch itself (has a black cover and two pins sticking out).  Check the Voltage on the Black Wire at the Sensor and the Back of the Towed Vehicle Socket.  We want to know what this voltage is.  If it is 12 Volts we are good.  If it is less on any line, we may have some additional problems with the system and Remco would advise one to call us as further troubleshooting with our technicians will be needed.