TaoTao 110cc ATV Wiring Diagram, AC CDI, Starter, Regulator, No Spark

User question

how to wire a taotao 110cc atv

Artificial Intelligence Response

Direct answer to the question

A TaoTao 110cc ATV is usually wired like a typical Chinese horizontal-engine 110cc ATV with an AC CDI ignition system. The main circuits are:

• Battery and starter circuit
• Ignition/CDI circuit
• Kill switch/key switch circuit
• Charging circuit
• Lights and brake switches

The most common wire colors are:

Wire color	Typical function
Green	Ground / battery negative
Red	Battery positive, constant 12 V
Black	Switched 12 V after key switch
Black/White	CDI kill wire, grounds to stop engine
Black/Red	Stator exciter power to CDI
Blue/White	Pickup/trigger coil to CDI
Black/Yellow	CDI output to ignition coil
Yellow	Stator AC output to regulator/lights
White	Second stator charging wire
Red from regulator	Charging output to battery positive

Color codes can vary, so verify with a multimeter if possible.

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Detailed problem analysis

1. Battery, fuse, and main power wiring

The battery powers the starter system, lights, brake light, horn if fitted, and accessories.

Basic wiring:

Battery + → main fuse → key switch red wire
Battery - → engine/frame ground
Battery + → large starter solenoid post
Other large solenoid post → starter motor

Important points:

• The battery negative must be bolted to clean bare metal on the engine or frame.
• The engine and frame must share the same ground.
• Use a fuse, usually around 10 A to 15 A, in the smaller red power feed going to the harness.
• The heavy starter cables are not protected by the small fuse, so avoid shorting them.

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2. Starter solenoid wiring

The starter solenoid has:

• Two large terminals
• Two small trigger wires

Typical layout:

Large terminal 1 → Battery +
Large terminal 2 → Starter motor
Small wire 1 → 12 V from start button/brake switch
Small wire 2 → Ground

On many TaoTao 110cc ATVs, the starter button only works when the brake lever is pulled.

Typical start-control path:

Battery + → fuse → key switch → black switched 12 V
Black switched 12 V → brake switch
Brake switch → start button
Start button → small solenoid trigger wire
Other small solenoid wire → ground

When the key is ON, the brake is held, and the start button is pressed, the solenoid closes and sends battery power to the starter motor.

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3. CDI ignition wiring

Most TaoTao 110cc ATVs use an AC CDI, not a DC CDI. That means the CDI gets its ignition power from the stator, not directly from the battery.

Typical AC CDI wiring:

CDI wire	Connects to
Black/Red	Stator exciter coil
Blue/White	Pickup/trigger coil
Green	Ground
Black/Yellow	Ignition coil primary
Black/White	Kill switch/key switch
Sometimes black	Switched 12 V or unused depending on harness

A simplified ignition circuit:

Stator black/red → CDI black/red
Stator blue/white → CDI blue/white
Stator green → CDI green/frame ground
CDI black/yellow → ignition coil input
Ignition coil body/ground terminal → frame/engine ground
Spark plug wire → spark plug
CDI black/white → kill switch/key switch

The ignition coil must be grounded well. Many coils ground through their metal mounting bracket, so rust, paint, or loose bolts can cause no-spark problems.

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4. Kill switch and key switch wiring

The black/white wire is the CDI kill wire.

For most AC CDI systems:

• Black/white not grounded = engine can run
• Black/white grounded = engine stops

Typical key switch logic:

Key position	Red to black	Black/white to green
OFF	Open	Connected
ON	Connected	Open

So the key switch usually does two things:

1. Sends battery power from red to black when ON.
2. Grounds the CDI kill wire when OFF.

Typical key switch wiring:

Red → battery + through fuse
Black → switched 12 V output
Green → ground
Black/White → CDI kill wire

If the ATV cranks but has no spark, temporarily unplug the black/white CDI kill wire. If spark returns, the key switch, kill switch, tether switch, or harness is grounding the CDI kill circuit.

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5. Stator wiring

The stator/magneto produces AC power for ignition and charging.

Common stator wires:

Stator wire	Function
Black/Red	AC ignition power to CDI
Blue/White	Pickup/trigger signal to CDI
Green	Ground
Yellow	Charging/lighting AC output
White	Charging AC output

Typical connections:

Black/Red → CDI
Blue/White → CDI
Green → ground
Yellow → regulator/rectifier
White → regulator/rectifier

Some engines may only have one yellow charging wire instead of yellow and white.

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6. Regulator/rectifier wiring

The regulator/rectifier converts stator AC into DC to charge the battery and power DC loads.

Typical 4-pin regulator wiring:

Regulator wire	Connects to
Yellow	Stator yellow
White	Stator white
Red	Battery positive / harness positive
Green	Ground

Basic layout:

Stator yellow → regulator yellow
Stator white → regulator white
Regulator red → battery + through harness/fuse
Regulator green → frame/battery negative

With the engine running, battery voltage should usually rise from about 12.5 V engine off to roughly 13.5 V to 14.5 V when revved slightly. If voltage never rises, the charging circuit has a fault.

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Minimal wiring to make the engine run

If your goal is only to get spark and start the engine, you can ignore lights and charging temporarily.

Minimum required ignition wiring:

Stator black/red → CDI black/red
Stator blue/white → CDI blue/white
Stator green → CDI green/ground
CDI black/yellow → ignition coil
Ignition coil ground → engine/frame ground
CDI black/white → leave disconnected to allow spark

Minimum electric-start wiring:

Battery + → starter solenoid large post
Other solenoid large post → starter motor
Battery - → engine ground
Small solenoid wire 1 → momentary 12 V from start button
Small solenoid wire 2 → ground

To stop the engine, touch the black/white CDI wire to ground.

This is useful for testing, but it bypasses some safety features. For normal use, reconnect the key switch, kill switch, brake switch, and tether switch if installed.

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Practical wiring guide

Step-by-step method

1. Disconnect the battery.

   • Remove the negative cable first.

2. Mount the main parts.

   • CDI
   • Regulator/rectifier
   • Starter solenoid
   • Ignition coil
   • Battery
   • Key switch
   • Handlebar switch
   • Brake switches

3. Connect grounds first.

   • Battery negative to engine.
   • Engine to frame if needed.
   • Green harness wires to frame/engine ground.

4. Connect starter circuit.

   • Battery positive to solenoid.
   • Solenoid to starter motor.
   • Start button/brake switch to solenoid trigger.

5. Connect CDI ignition circuit.

   • Stator black/red to CDI.
   • Stator blue/white to CDI.
   • CDI black/yellow to ignition coil.
   • CDI green to ground.
   • CDI black/white to kill/key switch.

6. Connect charging circuit.

   • Stator yellow/white to regulator.
   • Regulator red to battery positive feed.
   • Regulator green to ground.

7. Connect lights and accessories.

   • Black switched 12 V usually feeds brake light, horn, and light switches.
   • Tail/brake lights usually ground through green.
   • Headlights may be powered by switched DC or AC lighting depending on harness.

8. Install fuse and battery.

   • Use the correct fuse.
   • Connect battery positive first, then negative.

9. Test operation.

   • Key ON.
   • Brake held.
   • Press start.
   • Check for spark.
   • Check charging voltage with the engine running.

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Common no-spark troubleshooting

If the starter cranks but there is no spark:

1. Check the kill wire

Unplug the black/white wire from the CDI.

• If spark returns, the kill circuit is shorted to ground.
• Check the key switch, handlebar kill switch, tether switch, and harness.

2. Check grounds

Bad grounds are extremely common.

Check:

• Battery negative to engine
• Engine to frame
• CDI green wire
• Ignition coil mounting

3. Check CDI power from stator

With a multimeter set to AC volts, check the black/red stator wire while cranking.

Typical reading may be tens of volts AC while cranking. If there is no AC voltage, the stator exciter coil may be faulty.

4. Check pickup coil

Measure resistance from the pickup wire, usually blue/white, to ground. Exact values vary, but many are roughly in the 100 Ω to 200 Ω range.

5. Check ignition coil

Make sure:

• CDI black/yellow goes to coil primary.
• Coil is grounded.
• Spark plug cap is tight.
• Spark plug is good.

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Common starter problems

If pressing the start button does nothing:

1. Check battery voltage.
2. Check main fuse.
3. Make sure the key switch is ON.
4. Hold the brake lever.
5. Check if 12 V reaches the starter solenoid small trigger wire.
6. Check solenoid ground.
7. Bridge the two large solenoid posts briefly with caution.
   • If the starter spins, battery and starter motor are likely good.
   • The problem is likely the solenoid, start button, brake switch, or wiring.

Use caution when bridging solenoid posts because it can spark heavily.

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Typical simplified wiring diagram

 MAIN POWER
Battery + ── Fuse ── Red ── Key Switch ── Black switched 12 V
Battery - ───────── Green/frame/engine ground
STARTER
Battery + ── large solenoid post
Other large solenoid post ── Starter motor
Black switched 12 V ── Brake switch ── Start button ── Solenoid small wire
Other solenoid small wire ── Ground
IGNITION
Stator black/red ── CDI
Stator blue/white ── CDI
Stator green ── Ground
CDI black/yellow ── Ignition coil
Ignition coil ── Spark plug
CDI black/white ── Key/kill switch ── Ground when OFF
CHARGING
Stator yellow ── Regulator/rectifier
Stator white ── Regulator/rectifier
Regulator red ── Battery +
Regulator green ── Ground

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Important notes

• Do not assume every TaoTao harness uses identical colors.
• Some models use a 5-pin CDI, others use a 6-pin CDI.
• Some use a remote kill box or tether switch that can prevent spark.
• Some have a brake safety switch in the starter circuit.
• Do not permanently bypass safety switches on a child’s ATV unless you fully understand the risk.
• If the old harness is cut, burned, corroded, or heavily modified, replacing the whole harness kit is often faster and safer than repairing wire by wire.

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Brief summary

To wire a TaoTao 110cc ATV:

• Green goes to ground.
• Red is battery positive.
• Black is switched 12 V.
• Black/red from stator powers the CDI.
• Blue/white triggers the CDI.
• Black/yellow goes from CDI to ignition coil.
• Black/white is the kill wire; ground it to stop the engine.
• Yellow/white from stator go to the regulator.
• Regulator red charges battery positive.

If you only need to test the engine, wire the stator, CDI, coil, ground, battery, starter solenoid, and leave the black/white kill wire disconnected. Then add the key switch, brake switch, regulator, and lights once the engine runs.

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