15 multiple choice 1 point brake drag can be caused by
- a bent rim.
- a sticking brake caliper.
- air in the brake line.
- a brake lever adjustment that’s too loose.
16 essay 1 point describe the steps you would take to troubleshoot a stator type charging system that is not charging, beginning with the source and ending with the battery. be sure to indicate what wires/plugs will be tested and what function the meter will be set on. this should be written as if you are a tech - support agent walking someone who has no idea through the process step - by - step.

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Accepted Answer

### Question 15 (Multiple Choice)
# Brief Explanations:
- A bent rim affects wheel balance/tyre contact, not brake drag.
- A sticking brake caliper keeps brake pads applied to the rotor, causing drag.
- Air in brake lines causes spongy brakes, not drag.
- A loose brake lever adjustment would reduce braking force, not cause drag.
# Answer:
B. a sticking brake caliper.

### Question 16 (Essay)
# Brief Explanations:
1. **Step 1: Safety & Prep**
   Ensure the vehicle is off, keys removed, and parking brake set. Gather a multimeter (set to DC voltage initially, later DC current/resistance as needed).

2. **Step 2: Check Battery Voltage**
   Connect multimeter leads (red to positive, black to negative) to the battery terminals. A healthy battery should show ~12.4–12.7V (DC voltage). If below 12V, charge the battery first (but proceed if testing the charging system).

3. **Step 3: Start the Engine & Check Alternator Output**
   Start the engine (idle or ~2000 RPM). Reconnect the multimeter to the battery (same terminals). The voltage should rise to ~13.8–14.8V (DC voltage). If not, move to the alternator.

4. **Step 4: Inspect Alternator Connections**
   Locate the alternator. Check the large battery cable (positive terminal on alternator) for tightness/corrosion. Also, check the smaller “exciter” wire (usually a plug) for secure connection.

5. **Step 5: Test Alternator Stator Windings (Resistance Test)**
   Disconnect the alternator’s electrical connector (or remove the stator wire plug). Set the multimeter to ohms (Ω). Measure resistance between the stator’s three terminals (usually labeled “R,” “S,” “T” or similar). Resistance should be low (e.g., ~0.5–5Ω, depending on the vehicle) and equal between all three pairs (R-S, R-T, S-T). If open (infinite resistance) or unequal, the stator is faulty.

6. **Step 6: Test Alternator Diode Trio (Voltage Drop Test)**
   Keep the multimeter on DC voltage. Connect red lead to the alternator’s battery terminal (positive), black lead to each stator terminal (one at a time). The voltage should be ~0.5–1V (forward bias). Reverse the leads (black to battery terminal, red to stator terminal) – voltage should be ~12–14V (reverse bias, indicating diodes are blocking). If not, diodes are faulty.

7. **Step 7: Check Voltage Regulator (If External)**
   If the regulator is external (connected to the alternator or in the wiring), test its input (battery voltage at the regulator plug) and output (voltage to the alternator’s exciter wire). With the engine running, the regulator should supply ~12V to the exciter wire (check with multimeter on DC voltage). If not, replace the regulator.

8. **Step 8: Recheck Battery & Charging**
   After fixing/replacing components, repeat Step 3. If voltage is now ~13.8–14.8V, the system is charging. If not, re-inspect connections or replace the alternator.

# Answer:
To troubleshoot a stator - type charging system (starting from the source, ending with the battery) as a tech - support agent:

### Step 1: Safety and Preparation
Ensure the vehicle is turned off, the key is removed, and the parking brake is engaged. Get a multimeter and set it to the DC voltage mode initially (we’ll adjust it later as needed).

### Step 2: Check the Battery Voltage
Connect the red multimeter lead to the positive (+) battery terminal and the black lead to the negative (-) terminal. A fully charged, healthy battery should show a voltage between 12.4 V and 12.7 V (measured in DC voltage). If the voltage is below 12 V, the battery might be discharged, but we’ll still proceed to test the charging system.

### Step 3: Test the Alternator’s Charging Output
Start the vehicle’s engine (let it idle or rev it slightly to around 2000 RPM). Keep the multimeter connected to the battery terminals (red to +, black to -). The voltage should increase to a range of 13.8 V to 14.8 V (DC voltage). If the voltage doesn’t rise to this range, there’s an issue with the charging system, and we’ll move on to inspect the alternator.

### Step 4: Inspect Alternator Connections
Locate the alternator. Check the large battery cable (connected to the alternator’s positive terminal) for tightness and signs of corrosion. Also, check the smaller “exciter” wire (usually a plug - in connector) to ensure it’s securely connected to the alternator.

### Step 5: Test the Stator Windings (Resistance Test)
Disconnect the alternator’s electrical connector (or the plug for the stator wires). Set the multimeter to the ohms (Ω) mode. Measure the resistance between each pair of the stator’s three terminals (these terminals are often labeled, for example, “R,” “S,” and “T”). The resistance should be low (typically between 0.5 Ω and 5 Ω, depending on the vehicle) and should be approximately the same for all three pairs (R - S, R - T, and S - T). If the resistance is infinite (open circuit) or the values between the pairs are very different, the stator is faulty and needs to be replaced.

### Step 6: Test the Alternator’s Diode Trio (Voltage Drop Test)
Keep the multimeter in DC voltage mode. Connect the red lead to the alternator’s battery terminal (positive) and the black lead to each of the stator terminals (one at a time). You should see a voltage drop of about 0.5 V to 1 V (this is forward - bias voltage for the diodes). Then, reverse the leads: connect the black lead to the alternator’s battery terminal (positive) and the red lead to each stator terminal. The voltage should be around 12 V to 14 V (this shows the diodes are blocking current in reverse, which is correct). If these voltage drops are not as expected, the diodes are faulty.

### Step 7: Check the Voltage Regulator (If External)
If the voltage regulator is external (either connected to the alternator or in the wiring harness), test its input and output. First, check the input: connect the multimeter (in DC voltage mode) to the regulator’s input plug (it should receive battery voltage). Then, check the output: with the engine running, the regulator should supply around 12 V to the alternator’s exciter wire (measure this with the multimeter on DC voltage). If the regulator isn’t providing the correct voltage, replace it.

### Step 8: Re - check the Battery and Charging System
After repairing or replacing any faulty components, start the engine again and repeat Step 3. If the battery voltage now rises to 13.8 V to 14.8 V, the charging system is working. If not, re - inspect all connections or consider replacing the alternator.

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Question 15 (Multiple Choice)

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Question 16 (Essay)