Sealey BT91/7 - Manual (Page 2)

For Jack Sealey Ltd. Sole UK importer of Sealey Professional Tools.
BT91/7C - 0008 - (1) - 150501
01284 757500 01284 703534 E-mail: [email protected]
NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: No liability is accepted for incorrect use of this equipment.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
INFORMATION: For a copy of our latest catalogue and promotions call us on 01284 757525 and leave your full name and address, including postcode.
Sole UK Distributor,
Sealey Group,
Bury St. Edmunds, Suffolk.
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.
6V & 12V Battery Tester
Model: BT91/7C
89/336/EEC EMC Directive
Signed by Mark Sweetman 15th May 2001
3.4. Load test chart
Load Test Result Battery Condition
OK - green, fig.1.F - 12v Battery capacity is good. May or may not be fully charged. Check electrolyte specific gravity to determine charge state.
fig.1.B - 6v If not fully charged check for charging system fault (para. 3.6) or electrical drain.
Bad or Weak - red or yellow, Battery capacity is unsatisfactory. Battery may be either: (1) defective or (2) partly discharged.
but reading steady. Check electrolyte specific gravity. If over 1.225 battery is defective. If under 1.225 recharge battery and retest. If cell-to-cell
fig.1.D/E - 12v specific gravity varies by more than 0.025 a cell defect may exist. If charging does not bring specific gravity to full charge
fig.1.A/C - 6v level battery is either sulphated or has lost active material.
Bad or Weak - red or yellow, Battery may be defective. Release load switch and note meter reaction. If voltage recovers to 12 volts (6 volts for 6 volt
but reading falling after battery) or more in a few seconds then battery is probably defective. If voltage recovers slowly battery may only be
10 secs. on load. discharged. Check electrolyte specific gravity and proceed as above.
3.5. Battery voltage/charge level
3.5.1. If the load test result indicates a battery fault allow battery to stabilize for a few minutes and then read the open circuit voltage - meter reading with load switch ‘Off’.
3.5.2. Compare the reading with the Voltage/Charge table below to get an estimation of the charge level.
Open Circuit Voltage Charge %
12 volt/6 volt battery
11.7/5.8 or lower . . . . . . . . . . . . . . . . . . .0
12.0/6.0 . . . . . . . . . . . . . . . . . . . . . . . . .25
12.2/6.1 . . . . . . . . . . . . . . . . . . . . . . . . .50
12.4/6.2 . . . . . . . . . . . . . . . . . . . . . . . . .75
12.6/6.3 or higher . . . . . . . . . . . . . . . . .100
3.5.3. The battery is considered charged at 75% or more. If it failed the load test with this charge it should be replaced. If the voltage indicates a charge level below
75% then charge the battery and load test again. If it fails this second test replace it.
3.6. Charging system (12 volt)
3.6.1. Start engine and allow to reach normal operating temperature. Switch off all accessories.
3.6.2. Run engine at 1200 to 1500rpm and note meter reading, which should be in the green ‘OK’ sector (fig.1.H). DO NOT press the load switch.
3.6.3. Switch on head lights and heater fan (highest speed), meter reading should remain in the green ‘OK’ sector.
3.6.4. A reading in the red sector to the left (fig.1.G) indicates a fault in the charging system which will cause the battery to be under charged. A reading in the red
sector to the right (fig.1.I) indicates a fault which will cause the battery to be over charged.
Note: Although not marked on the meter scale the ‘OK’ range for a 6 volt charging system is 6.8 to 7.5 volts.
3.7. Starter motor (12 volt)
Note: This test requires that the battery is in good condition and is charged to at least 75% capacity.
3.7.1. Disable ignition system (remove fuse or similar) so that engine will not start.
3.7.2. Carry out a load test (para. 3.3.), if not already done, and note voltage reading.
3.7.3. Use the table on the meter (fig.1.J) to determine the equivalent minimum cranking voltage. Note that for engines of less than 3.25 litres take the next higher
figure. For example: a) 3.5 litre engine - load test result 11.0 volts, gives min. cranking voltage of 9.7 volts.
b) 1.5 litre engine - load test result 11.0 volts, gives min. cranking voltage of 10.2 volts
3.7.4. Operate the starter motor and note the voltage during cranking.
3.7.5. A reading below the minimum cranking voltage indicates that the starter motor is taking excessive current. This may be due to poor connections, to a faulty
motor or to the battery being too small for the vehicle.
3.7.6. After test reinstate ignition system.
Note: For a 6 volt system test as above and note load test voltage. Double this value and determine equivalent min. cranking voltage as in 3.7.3. Halve the figure to
give min. cranking voltage for the 6 volt system and then proceed from 3.7.4.
3.3. Battery load test
NOTE: ON THE FIRST LOAD TEST SMOKE MAY BE EMITTED FROM THE LOUVRES IN THE TESTER CASING. THIS IS OIL BURNING OFF THE LOAD COILS
AND IS NORMAL.
3.3.1. Press load switch (fig.2) and hold until meter reading stabilizes, or for a maximum of 10 seconds.(failure to release the switch after 10 seconds may result
in the switch burning out and your warranty being invalidated). Note meter reading and then release load switch.
3.3.2. Compare meter reading with load test chart (3.4) to determine battery condition.
Notes: a) For 12 volt batteries the green sector (fig. 1.F) border is marked with nominal cranking current from 300 to 500 amps and stepped in 50 amp intervals.
Record this figure and compare with battery manufacturer’s quoted figure to give an indication of any deterioration.
b) Battery performance falls at low temperatures and quoted cranking amps should be reduced by 50 amps at 20 O F(-7 O C) and 100 amps at 0 O F(-18 O C).