Ferguson TE20 Starter & Ignition Comparison Guide

Starter Switch vs Starter Solenoid vs Ignition Switch

When repairing starting issues on a Ferguson TE20 petrol, it’s important to understand the difference between the ignition switch, starter switch, and starter solenoid. Each component performs a separate role in the electrical system.

Installing the wrong part can result in continued starting problems, so here’s a simple breakdown.

🔑 1️⃣ Ignition Switch

What it does:
Supplies power to the ignition system.

Function:

• Turns electrical system on/off

• Sends power to ignition coil

• Allows engine to run

Common Symptoms of Failure:

• No spark

• Engine won’t start

• Intermittent power loss

• Tractor cuts out while running

👉 Example: Bare Co B3837 – TE20 Petrol Ignition Switch

⚡ 2️⃣ Starter Switch

What it does:
Manually engages the starter motor circuit.

Function:

• Connects battery power to starter motor

• Used when pressing starter lever/button

• Controls cranking

Common Symptoms of Failure:

• Starter does not crank

• Intermittent starting

• No response when pressing starter

👉 Example: Bare Co B3794 – TE20 Petrol Starter Switch

🔋 3️⃣ Starter Solenoid

What it does:
Acts as a heavy-duty electrical relay for the starter motor.

Function:

• Transfers high current from battery to starter

• Protects switch from heavy load

• Used in some starter systems

Common Symptoms of Failure:

• Clicking sound but no cranking

• Starter engages intermittently

• Burnt electrical smell

👉 Example: Bare Co B3876 – MF / Ford Starter Solenoid

Quick Diagnosis Table

Why This Matters for TE20 Owners

Understanding these differences:

✔ Prevents incorrect part purchases
✔ Reduces downtime
✔ Improves starting reliability
✔ Supports successful 6V to 12V conversions

Agline stocks quality Ferguson TE20 ignition switches, starter switches, and starter solenoids to keep your tractor starting reliably.