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T-BOB De Luxe User Guide

T-BOB De Luxe User Guide

tail light tester

T-BOB Tail Light Tester Functional Layout

It is always difficult to determine trailer plug and socket configurations from inspection. Some determination must be made, however, before connections between tow-vehicle and trailer can be made.

The following usage activities should be performed in sequence to ensure the best results.

The concept of how T-BOB operates comes from many years’ experience before wiring standards were established.
Testing with T-BOB cuts out many of the hassles that is normally associated with trailer tail light testing.
But best of all is that with the T-BOB kit you should be able to do everything singlehandedly.

SAFETY WARNING

Please note that an understanding of electrical circuit testing is essential before attempting to use T-BOB. The use of this device could cause damage to tow-vehicle or trailer wiring. This generally happens as a result of incorrect wiring configurations or by forcing ( + ) Positive to ( – ) Negative or Common “Earth” (as it will be referred to in this write-up) circuits which could cause a short circuit and blow fuses or precipitate a wiring or circuit failure. T-BOB assumes no liability for any damages caused, either direct or consequential when using the tail light connection tester.

STEP 1: CHECK CONNECTORS

Check to see that the pin-outs of the tow-vehicle connector and trailer connector match the connectors on T-BOB tail light tester. All connector surfaces should be clean and free of dirt. Once this determination is made and you are ready to proceed to the next step.

STEP 2: CHECK TOW VEHICLE EARTH CONNECTION

Before any testing with T-BOB can commence, ensure that pin 3 as is shown in Figure 2 of the tow vehicle plug is connected to the Earth ( – ) of the tow vehicle. Unless this can be verified that this connection is correct you should not attempt to plug T-BOB into the tow vehicle.

Tow Vehicle Earth Determination

Use a continuity tester to measure between pin 3 of the tow-vehicle plug and the tow-vehicle chassis. Do not continue to the next step unless you are 100% certain that the earth connection is correct, well connected and on pin 3.

If the tow-vehicle earth connection is not on pin 3 the wiring of the tow-vehicle must be corrected or it might be that your tow-vehicle wiring does not comply with ISO 1724 standards in which instance no further use of T-BOB should be attempted until such time that the earth connection have been rectified.

STEP 3: TOW VEHICLE TAIL LIGHT TESTING USING T-BOB

At this point you have already determined that pin 3 of your tow-vehicle plug is connected to earth on your tow vehicle.

T-BOB used in break-open mode facilitates the determination of the Tow-Vehicle Tail Light operation.

tail light tester, tail light, tow vehicle

T-BOB Tow Vehicle Test Configuration

  1. With all toggle switches in the centre position, connect T-BOB to the tow-vehicle plug as shown in (Figure 3).
  2. Select Toggle Switch 3 (Earth) to “Tow-Vehicle” This will enable negative/earth reference of all circuits to the tow vehicle.
  3. Always plug T-BOB tail light tester connector firmly into the
    tow-vehicle connector, always ensure that the connectors are fully inserted.
  4. T-BOB contains separate LEDs for each tail light indicator.
    In this mode the LEDs are powered directly from the tow-vehicle tail light circuits,
    which eliminate the need for external batteries.
  5. Activate tow-vehicle tail light indicators (Left Indicator, Right Indicator, Park Light Indicator and Brake Light Indicator) successively from within the tow-vehicle and ensure that each indicator is displayed on the LED allocated for the particular indicator.
  6. Only if all indicators are working in the appropriate manner can it be assumed that the tow-vehicle tail light wiring configuration is correct.

TROUBLE SHOOTING

If at the point of initial connection, of T-BOB to the tow-vehicle, it is found that no LED indicators displays make sure that switch 3 is correctly selected or there could still be a problem with the ground wire on pin 3
If at the point of initial connection, of T-BOB to the tow-vehicle, it is found that some tail light indicators does not display correctly then corrective actions must first be taken before any further connections can be made.
T-BOB allows easy mechanical access to each indicator line with a multi-meter, continuity-tester or other relevant test equipment should it be required to initiate fault finding actions.
An optional extension cable connected between the tow-vehicle and T-BOB will allow a person to check and monitor tow-vehicle plug connections from within the tow vehicle.

STEP 4: CHECK TRAILER EARTH CONNECTION

Use a continuity tester to measure between pin 3 of the trailer plug and the trailer chassis. Do not continue to the next step unless you are 100% certain that the earth connection is correct and on pin 3.

If the trailer earth connection is not on pin 3 the wiring of the trailer must be corrected or it might be that your trailer wiring does not comply with ISO 1724 standards in which instance no further use of T-BOB should be attempted
until such time that the earth connection have been rectified.

STEP 5: T-BOB Trailer Tail Light Connection Testing, Independent of Tow-Vehicle.

trailer tail light , trailer tester

T-BOB Trailer Test Confiuration

T-BOB used in break-open mode facilitates this determination. With all switches in the centre position, attach the T-BOB to the trailer socket connector (Figure 5).

  1. Connect an external +12 Volt power source to T-BOB to enable independent trailer tail light testing. A +12 Volt power cable is included in the T-BOB kit. This cable can be connected directly to the tow-vehicle battery terminals.
  2. Always plug T-BOB tail light tester connector firmly into the tow-vehicle or trailer connector. Whenever using T-BOB always ensure that the connectors are fully inserted.
  3. Select Toggle Switch 3 (Earth) to “Trailer” position. This will enable ground/earth reference from the external battery source
  4. T-BOB contains separate activation test switches and LED indicators corresponding to every tail light (Left Indicator, Right Indicator, Park Light Indicator and Brake Light Indicator). The trailer tail lights and indicator LEDs will be powered from the external +12 Volt power source. Which could be your Tow-Vehicle.
  5. Trailer tail lights can now be turned on from the individual toggle switches on T-BOB one at a time whilst tail light indicators operation is checked
  6. Only if all tail light indicators respond correctly to the relevant activation toggle switch on T-BOB, can it be assumed that the trailer tail light wiring configuration is correct and functioning.

TROUBLE SHOOTING

If at the point of connecting T-BOB to the trailer socket and through the testing routine, it is found that some tail light indicators does not display correctly, then corrective actions must first be taken before any further connections can be made.
If at the point of initial connection, of T-BOB to the trailer socket, it is found that no LED indicators displays make sure that switch 3 is correctly selected or there could still be a problem with the ground wire on pin 3
T-BOB allows easy mechanical access to each indicator circuit using a multi-meter, continuity-tester or other relevant test equipment should it be required to perform fault finding activities.

STEP 6: T-BOB Trailer Tail light connection testing in conjunction with the Tow-vehicle

trailer tail light,

T-BOB Final Trailer Tail Light Testing Configuration

Before attempting to test the trailer tail light connections in conjunction with the tow vehicle both the tow-vehicle and trailer wiring configurations testing should have been successfully completed. Only if the wiring configuration of both the tow-vehicle and the trailer have been verified to be correct can this step commence.

  1. Disconnect the +12 Volt External Power Cable from T-BOB
  2. With all toggle switches in the centre position, attach T-BOB to both the tow-vehicle and the trailer connectors (Figure 6).
  3. Select Toggle Switch 3 (Earth) to “Tow-Vehicle” This will enable ground/earth reference from the tow vehicle
  4. Select all toggle switches to the “Tow-Vehicle” position.
  5. In this mode all circuits are powered directly from the tow-vehicle.
  6. Activate each tail light indicator consecutively form within the tow vehicle and check tow-vehicle tail light operation.
  7. Only if all tail light indicators respond correctly to the relevant tail light activation on T-BOB, can it be assumed that the trailer tail light wiring configuration is correct and functioning.
  8. Trailer tail lights can now be turned on or off from the individual toggle switches on T-BOB one at a time whilst tail light indicators operation is checked.

TROUBLE SHOOTING

If at the point of initial connection, of T-BOB to the trailer socket, it is found that no LED indicators displays make sure that switch 3 is correctly selected or there could still be a problem with the ground wire on pin 3
If at the point of connecting T-BOB to the trailer socket and through the testing routine, it is found that some tail light indicators does not display correctly, then corrective actions must first be taken before any further connections can be made.

ADVANCED TROUBLE SHOOTING

7 pin connector,

7 Pin Connector and Plug Functions

T-BOB Advanced TOW-VEHICLE and TRAILER Wiring Fault Finding

Please Note: This mode of operation requires know-how and should only be attempted by persons who are proficient with working with electrical circuits.

T-BOB makes it possible to easily check individual wires between Tow-Vehicle-plug-connection-pins and respective tail-light-bulb output connections.

T-BOB allows easy mechanical access to each indicator circuit using a multi-meter, continuity-tester or other relevant test equipment should it be required to perform fault finding activities.

sabs 1327, iso 1724, type 12n7

Trailer Wiring Diagram SABS 1327

An optional extension cable connected between the tow-vehicle and T-BOB will allow a person to single handedly check and monitor tow-vehicle plug connections

STEP A1: T-BOB Advanced TOW-VEHICLE Wiring Fault Finding

Connect T-BOB in the break-open mode (with all switches in the centre position) to the tow-vehicle only (Fig 4)

  • Disconnect the tow-vehicle +12V battery terminal.
  • Remove all tow-vehicle tail light bulbs.

T-BOB allows easy mechanical access to individual indicator lines.

Use the continuity tester to verify that a proper ground connection exists between the tow-vehicle body, tail light ground connection and pin 3 on the tow-vehicle tail light connection plug.

Use a continuity tester to measure each circuit separately to ensure end to end connectivity.

STEP A2: T-BOB Advanced TRAILER Wiring Fault Finding

Please Note: Using T-BOB in this mode requires know-how and should only be attempted by persons who are proficient with working with electrical circuits.

T-BOB makes it possible to easily check individual wires between Trailer-socket-connection-pins and respective tail-light-bulb output connections.

  • Connect T-BOB in the break-open mode (with all switches in the centre position) to the trailer. (Fig 5)
  • Remove external battery sources from T-BOB
  • Remove all trailer light bulbs.

T-BOB allows easy mechanical access to individual indicator lines.

Use the continuity tester to verify that a proper ground connection exists between the trailer body, tail light ground connection and pin 3 on the trailer tail light connection socket.

Use a continuity tester to measure each circuit separately to ensure end to end connectivity.

 

Happy tbobbing