Sealey BT91/5 - Manual (Page 2)

3.2.5. If you do not notice a voltage increase, or only a very slight increase, attach the red clamp (7) to terminal B+ on the alternator and the
black clamp (7) to an earth point.
3.2.6. If the voltmeter (3) indicates a voltage in accordance with the alternators specifications (not observed in para 3.2.4. above), there is
an excessive voltage drop in the line from the alternator to the positive battery terminal, or in the earth connection. Insufficient voltage
is a consequence of a defect in the alternator, probably due to a defective rectifier diode or a defect in the regulator.
3.3. FEED VOLTAGE TEST (Headlights, coil, etc)
3.3.1. Connect the black clamp (7) to an earth or the negative (-) terminal on the battery.
3.3.2. Connect the red clamp (7) to a point on the device you wish to check.
3.3.3. Observer the voltage on the voltmeter (3)
3.4.
CHECKING VOLTAGE DROP OR FAULTY CONTACTS BETWEEN THE BATTERY AND STARTER MOTOR
3.4.1. Disconnect the positive (+) feed to the coil so that the engine does not start.
3.4.2. Select 3.2V on the voltmeter (3) using the switch (4).
3.4.3. Connect the black clamp (7) to the negative (-) terminal on the battery.
3.4.4. Connect the red clamp (7) to the starter motor housing.
3.4.5. Turn the ignition key to activate the starter motor. Press button (2) and observe the voltage drop on the voltmeter (3). The voltage
drop observed should be no more than 0.25V for 6V systems, 0.5V for 12V systems and 1.0V for 24V systems.
3.5. CHECKING VOLTAGE DROP IN THE DIFFERENT INTAKE AND CHARGING CONNECTIONS OF THE SYSTEM
3.5.1. Select the 24V range using the selector switch (4).
3.5.2. Connect the red clamp (7) to the positive (+) terminal of the battery and the black clamp (7) to the positive (+) terminal of the
accessory to be examined.
3.5.3. Turn on the accessory (ie headlights) and you should observe a slight change in the indicated voltage.
3.5.4. Select the 3.2V range using the selector switch (4), press the button (2) and observe the voltage drop. The maximum allowable
voltage drop is 0.25V for 6V systems, 0.5V for 12V systems and 1.0V for 24V systems.
3.6. ELECTRICAL SYSTEM SHUTDOWNS
3.6.1. Set the voltmeter (3) using the selector switch (4) according to the system voltage.
3.6.2. Connect the black clamp (7) to the negative (-) terminal of the battery or the vehicle frame.
3.6.3. Connect the red clamp (7) to the positive (+) terminal of the component to be checked. Note: It may be necessary to switch the
ignition and the accessory on in order to get a reading on the voltmeter (3).
3.6.4. If the voltmeter (3) does not show a reading, there is probably a defect in the contact switch.
3.7.
BATTERY CHARGING CURRENT
3.7.1. Disconnect the battery cable from the negative (-) terminal of the battery.
3.7.2. Connect the red clamp (1) to the negative (-) battery terminal.
3.7.3. Connect the black clamp (1) to the disconnected battery cable.
3.7.4. Touch the negative (-) battery cable to the negative (-) terminal on the battery and start the vehicle.
3.7.5. Remove the negative (-) cable from the negative (-) terminal of the battery, keeping the engine running at medium speed and observe
the current on the ammeter (6). After a few seconds the current will drop gradually and stabilise. Note: It is recommended that all
accessories be switched off during this test.
3.7.6. To make simultaneous use of the voltmeter, connect the red clamp (7) to the positive (+) battery terminal and the black clamp (7) to
the negative (-) battery terminal.
3.7.7. The voltage indicated on the voltmeter should be between 13.5V and 14.5V for 12V batteries and between 27V and 29V for 24V
batteries, if the alternator is functioning correctly.
3.8. BATTERY DISCHARGE CURRENT
3.8.1. Ensure that the vehicle’s engine is switched off and the starter motor remains deactivated.
3.8.2. Disconnect the the battery cable from the negative (-) terminal of the battery.
3.8.3. Connect the black clamp (1) to the disconnected negative (-) battery cable.
3.8.4. Connect the red clamp (1) to the negative (-) terminal of the battery.
3.8.5. Switch on the ignition (ensuring the starter motor remains deactivated) and the consuming accessory you wish to test.
3.8.6. The current consumption will be indicated on the ammeter (6).
3.9.
EQUALISING
3.9.1. Carry out paragraphs 3.7.1. to 3.7.5.
3.9.2. Turn on the corresponding devices (lights and accessories).
3.9.3. The ammeter (6) will indicate “0” if the alternator is supplying the same current as the existing consumption.
3.9.4. The ammeter (6) will indicate from “0” towards the right if the alternator is supplying more current than the existing consumption.
3.9.5 The ammeter (6) will indicate from “0” towards the left if the current consumption is greater than that being supplied by the alternator.
For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
Declaration of Conformity We, the sole UK importer, declare that the product listed below is in conformity with the following standards and directives.
The construction file for this product is held by the manufacturer and may be inspected,
by a national authority, upon request to Jack Sealey Ltd.
Voltmeter/Ammeter - 9 Function
Model: BT91/5.V3
89/336/EEC EMC Directive
93/68/EEC CE Marking Directive
Signed by Mark Sweetman 16th November 2005
4. DECLARATION OF CONFORMITY
BT91/5.V3 - 1 - 161105
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Sealey Group,
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