OCA ELE01 Module 1B

A flow chart says to run the fan motor and check for a good connection between terminal #3 and the vehicle frame. The best way to do this is to check the:

• voltage drop between the two points.

• operation of the fan motor.

• current flow between the two points.

• resistance between the two points.

A fan motor is in series with a resistor. The resistor gets hot when the fan motor is running. The voltage drops across the motor and resistor will read:

• the sum of both of the voltage drops.

• the same.

• 8 volts across the motor and 4 volts across the resistor.

• in proportion to the resistance of each load.

Voltage measured across a turn signal bulb should be:

• full source voltage.

• 0.1 volt.

• 3 volts

• 0.3 volt.

In a parallel circuit, if two bulbs each draw 3 amps and an instrument panel lamp draws 1 amp, the total current in the circuit is:

• 4 amps.

• 3 amps.

• 12 amps.

• 7 amps.

A blower motor fuse blows after replacing the motor. The problem could be:

• too large of a fuse in the circuit.

• lower resistance in the new motor than the original part.

• an open somewhere else in the circuit.

• that the new motor has the same resistance as the original part.

A flow chart says that a circuit is formed between terminals 3 and 8 with the switch in the UP position. This can be checked, without disconnecting the switch from the circuit, by using a:

• DVOM to measure voltage drop across terminals 3 and 8 with the switch held UP.

• jumper wire between terminals 3 and 8.

• DVOM to measure resistance across terminals 3 and 8 with the switch held UP.

• test light across terminals 3 and 8 with the switch held UP.

A load connected to a corroded ground:

• is like another load connected in series. Part of the voltage will drop across the corroded ground.

• is not detectable with a DVOM.

• requires a higher amperage fuse.

• will not affect the normal operation of the circuit.

A wire runs behind a damaged door panel from a connector ground terminal to a ground bolt. To check continuity between the ground terminal and the ground bolt, use a:

• DVOM to read ohms and check for continuity.

• DVOM to check the voltage drop while operating the door lock.

• test light with a continuity beeper.

• jumper wire.

A rear wiper circuit is ground-side switched. A voltage reading at a connector on the ground side of the load shows full source voltage. This likely means:

• a correctly operating circuit.

• a blown fuse

• the rear wiper is not turned on.

• a faulty wiper motor.