Practice Exercises: Components

Exercise 1: Battery Testing

Objective

Perform comprehensive battery health assessment.

Tools Needed

• Digital multimeter
• Battery charger (smart type)
• Load tester or carbon pile (optional)

Procedure

Part A: Open Circuit Voltage (OCV)

1. Ensure battery rested 2+ hours
2. Set multimeter to DC Volts
3. Measure across terminals
4. Record: __ V

Reading	State of Charge
12.6V+	100%
12.4V	75%
12.2V	50%
12.0V	25%
<11.8V	Discharged

Assessment: __

Part B: Load Test

1. Disable ignition (remove fuse or kill switch)
2. Crank engine for 10 seconds
3. Note lowest voltage during crank: __ V

Result	Status
>9.6V	Pass
9.0-9.6V	Marginal
<9.0V	Fail

Assessment: __

Part C: Charge Acceptance

1. Connect smart charger
2. Note initial charge mode and current
3. Time to reach float mode: __ hours
4. Compare to expected (2-4 hours from 50%)

Assessment: __

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Exercise 2: Charging System Test

Objective

Verify stator, regulator/rectifier, and system output.

Tools Needed

• Digital multimeter (AC and DC)
• Service manual for specifications

Procedure

Part A: Static Stator Test

1. Locate stator connector (usually 3 yellow wires)
2. Disconnect from R/R
3. Measure resistance between phases:
   • A to B: __ Ω
   • B to C: __ Ω
   • A to C: __ Ω

Expected: Equal readings, typically 0.1-1.0Ω Assessment: __

4. Measure each phase to engine ground:
   • A to ground: __ Ω
   • B to ground: __ Ω
   • C to ground: __ Ω

Expected: OL (infinite) on all Assessment: __

Part B: Dynamic Stator Test

1. Stator still disconnected
2. Start engine, rev to 3000 RPM
3. Measure AC voltage between phases:
   • A to B: __ VAC
   • B to C: __ VAC
   • A to C: __ VAC

Expected: 20-70VAC, all equal (±5%) Assessment: __

4. Reconnect stator to R/R

Part C: System Output Test

1. Start engine
2. Measure DC voltage at battery terminals:
   • Idle: __ VDC
   • 3000 RPM: __ VDC
   • 5000 RPM: __ VDC

Reading	Status
13.5-14.5V	Normal
<13.0V	Undercharging
>15.0V	Overcharging

Assessment: __

Part D: Ripple Test

1. Set multimeter to AC Volts
2. Engine at 3000 RPM
3. Measure AC voltage at battery: __ VAC

Ripple	Status
<0.3V	Good
0.3-0.5V	Monitor
>0.5V	Failing rectifier

Assessment: __

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Exercise 3: Parasitic Draw Test

Objective

Identify excessive current drain with ignition off.

Tools Needed

• Digital multimeter with 10A DC range
• Time (30 min for systems to sleep)

Procedure

Part A: Setup

1. Ensure all accessories off
2. Close all switches (kill switch, key off)
3. Note any aftermarket accessories installed

Part B: Measurement

1. Disconnect battery negative cable
2. Set multimeter to 10A DC
3. Connect meter between negative post and cable
4. Wait 30 minutes (let ECU/alarm sleep)
5. Record draw: __ mA

Draw	Status
<30mA	Normal
30-50mA	Check for clock, alarm
>50mA	Problem - investigate

Assessment: __

Part C: Isolation (if draw excessive)

1. Remove fuses one at a time
2. Note draw after each removal
3. When draw drops, that circuit has issue

Problem circuit found: __

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Exercise 4: Relay Testing

Objective

Test electromechanical relay function.

Tools Needed

• Digital multimeter
• 12V power source
• Test leads with clips

Procedure

Part A: Coil Resistance

1. Identify coil terminals (85, 86)
2. Measure resistance: __ Ω

Expected: 50-150Ω typical Assessment: __

Part B: Contact Test (De-energized)

1. Measure 30 to 87: __ Ω (should be OL)
2. Measure 30 to 87a: __ Ω (should be ~0)

Assessment: __

Part C: Contact Test (Energized)

1. Apply 12V to coil (+ to 86, - to 85)
2. Listen for click
3. Measure 30 to 87: __ Ω (should be ~0)
4. Measure 30 to 87a: __ Ω (should be OL)

Assessment: __

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Exercise 5: Connector Inspection

Objective

Evaluate connector condition and practice proper maintenance.

Tools Needed

• Inspection light
• Electrical contact cleaner
• Dielectric grease
• Pick or dental tool

Procedure

Part A: Visual Inspection

Inspect 3 different connectors on bike:

Connector 1: __

• [ ] Corrosion present?
• [ ] Damaged pins?
• [ ] Secure latch?
• [ ] Water entry signs?

Connector 2: __

• [ ] Corrosion present?
• [ ] Damaged pins?
• [ ] Secure latch?
• [ ] Water entry signs?

Connector 3: __

• [ ] Corrosion present?
• [ ] Damaged pins?
• [ ] Secure latch?
• [ ] Water entry signs?

Part B: Cleaning

1. Disconnect one connector
2. Spray with contact cleaner
3. Allow to dry
4. Apply dielectric grease to seals
5. Reconnect, verify secure latch

Observations: __

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Checklist Summary

Test	Result	Pass/Fail
Battery OCV
Battery load test
Stator resistance
Stator insulation
Stator AC output
System DC output
Ripple test
Parasitic draw
Relay coil
Relay contacts
Connector inspection

Overall assessment:

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Action items:

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