Using the EL 38758 Parasitic Draw Test Switch
- Ignition OFF, disconnect the battery negative cable from the battery. Refer to Battery Negative Cable Disconnection and Connection .
- Turn the EL 38758: switch knob to the OFF position.
- Install the male end of the EL 38758: switch to the battery ground terminal.
- Install the battery negative cable to the female end of the EL 38758: switch.
- Turn the EL 38758: switch knob to the ON position.
- Road test the vehicle and activate all of the accessories such as the radio and air conditioning.
- Ignition OFF, connect a 10 A fused jumper wire to the test switch tool terminals.
- Turn the EL 38758: switch knob to the OFF position. The current now flows through the jumper wire.
- Check the fuse in the jumper wire. The fuse should be OK.
- Failed: If the jumper wire fuse is blown, refer to Circuit/System Testing .
- Passed
- Turn the EL 38758: switch knob to the ON position. Remove the fused jumper wire.
- Connect a DMM set to the 10 A DC scale between the test switch tool terminals.
- Turn the EL 38758: switch knob to the OFF position. The current now flows through the DMM.
- As the vehicle systems shut down test for less than 30 mA of parasitic current drain.
- If greater than the specified range, refer to Circuit/System Testing .
WARNING:
Refer to Battery Disconnect Warning
.
CAUTION:
When a fused jumper wire or digital multimeter is connected to the test switch terminals, always turn the test switch ON before opening any access door, turning the ignition on, or turning any accessory on. This is to prevent damaging the jumper wire or digital multimeter fuse.
NOTE:
The switch knob on the EL 38758:
switch is marked ON and OFF. When the switch knob is in the ON position, the circuit is closed and electrical current will pass through the switch. When the switch knob is in the OFF position, the circuit is open and electrical current will not pass through the switch.